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maybe the stepper has an intermittent short in it. sounds faulty in any case. The current draw should be stable under a constant load.
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
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That was my first thought. Changed motors still does it, changed 4988 driver (could have been a fault) still does it but only with a scope probe, not multimeter or other implement only a scope probe (connected to a scope, not even selected channel, but connected).
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Wow. It almost sounds like maybe your scope is doing something to the signal. Could it be your scope is to blame?
ETA: My Salae was acting really strange one day, and I spent all day debugging because I couldn't figure out why my SPI signal was so off. It's still a mystery as the analyzer hasn't acted up since.
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
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Don't really think so, a cheapo R&S Pro branded UniT model, about 700mV on the probe...
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Inductor or capacitor - I forget which.
I had a similar problem 20+ years ago: the board was working really weirdly so I stuck a scope on to look at what was happening and ... the problem went away. I talked it over with Tektronix, and (apart from their first suggestion which was "ship a scope with each unit?") they were very helpful. IIRC, it was the scope probe capacitance that was fixing it and adding a couple of pF to the line smoothed it all out and it worked faultlessly from then on (though it may have been a small inductor we needed to add, I can't remember and the H/W designer died a few years ago.)
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I have been thinking that, I just try resoldering the connections to the module. Stupid thing is must be the capacitance as adding other probes or a screw driver doesn't do it (inductive, I think). It happens if I change the motor, the driver board.
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Quote: and the H/W designer died a few years ago.
Sorry, but that cracked me up. Feeling like the Bicentennial Man here: "Oh that guy that designed that system is long gone and the guy that took over is already retired too" 
forging iron and new ideas
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Andreas Saurwein wrote: "Oh that guy that designed that system is long gone and the guy that took over is already retired too"
I have not reached the 50s and I already have experienced something like that. 
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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Ground through the scope? The ring of the probe BNC connector is connected to earth.
I'm skeptical of the tiny (pF) capacitance of a scope probe "fixing" this, though it's not out of the realm of possibility depending on what you're connected to.
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Dave Kreskowiak wrote: Ground through the scope
I would agree.
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
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Do you have a cat? This is clearly a case where observation affects the observed.
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No Putty's involved, I'm not Griff!
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Found something like this behavior on an old NCR printer.
Found the client had cheated with a wire wrap pass of speed control
to get extra fast printing without paying for it.
Long ago when such things were part of leased equipment agreements. (Ha! SLA)
"A little time, a little trouble, your better day"
Badfinger
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Strengthen Aldi - no Tesco struggles! (11)
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Consolidate
Good getting two supermarkets in 
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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You are up tomorrow!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I kept trying to find anagrams that included ALDI but excluded TESCO. After all, the clue clearly stated there was no Tesco. 
It finally dawned on me, Tesco's not out, it's in and I was able to solve it. I liked this one! 
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So did I!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Damn it, just saw that I am longer member at Codeproject than some of my work colleagues are alive.
Does that make me feel old? Nope. Am having fun with that.
How many are members here since 20+ years and still active?
forging iron and new ideas
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A mere 16 years 7 months for me 
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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14 years here - but it doesn't feel like it at all! Doesn't time fly when you are having fun?
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I will hit 20* years this December. I first discovered CodeProject at work and it certainly helped with many issues that I worked on back then.
*I had been using it for a few years before I created an account.
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Definitely, although in the last few years it feels somehow overwhelming. So many new areas and technologies added. Stuff that one only hears about but never uses.
forging iron and new ideas
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Agree, I look at some stuff now and it doesn't make much sense to me. I remember spending a weekend learning C from K&R, so I could start a new project the following week. Now it takes me as long as I spent on that project to learn any new language (or even some features).
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way. The current draw is all over the place, it will not move! stick a scope probe on the ![Elephant | [mastadon]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/elephant.gif)
starts moving take the probe off stops, try pressing down (could be a faulty board) no, try another item, no; go back to scope probe Yes! It can't be RF, probe works grounded or not. 
Proper Weird!
