Unzipping zip files in C# using sharapzip lib

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C#3.5

Hi Team

I have used the sharziplib.dll to unzip aroung 1400 folders which contains text files.
However after processing around 236 folders I land up with an error called "End of stream".
My Code:

static void unzip()
        {
            try
            {
               
                var files = new List<string>(Directory.GetFiles(path, "*.zip*", SearchOption.AllDirectories));
                foreach (var item in files)
                {
 
                    var zipFileName = item;
                    var targetDir = Path.Combine(path,"unpack");
                    FastZip fastZip = new FastZip();
                    string fileFilter = null;
                    fastZip.ExtractZip(item, targetDir, fileFilter);
                    
                }

                Dictionary<string, int> Messagetype = new Dictionary<string, int>();
                var txtfiles = new List<string>(Directory.GetFiles(Path.Combine(path,"unpack"), "*.*", SearchOption.AllDirectories));
                foreach (var eachtxtfiles in txtfiles)
                {
                    //Reading the Text from the file
                    using (var reader = new StreamReader(eachtxtfiles))
                    {
                        string line;
                        int counter = 0;
                        line = reader.ReadLine();
                        while (line != null)
                        {
                            if (!string.IsNullOrEmpty(line))
                            {
                                //split the line
                                string[] parts = line.Split(new[] { "|" }, StringSplitOptions.None);

                                //get valid text
                                if (!Messagetype.ContainsKey(parts[1]))
                                    Messagetype[parts[1]] = 0;
                                Messagetype[parts[1]]++;
                            }
                            line = reader.ReadLine();


                        }

                    }
                    // Console.WriteLine(Messagetype.Count);



                }

                foreach (var ms in Messagetype.Keys)
                {
                    Console.WriteLine(ms + "-" + Messagetype[ms]);
                }
    


            }



            catch (Exception ex)
            {

                Console.WriteLine(ex.Message);
            }
            Console.ReadKey();

        }

What I have tried:

I made sure the folders are not corrupt ..
Contains only zip folders..
Same functions in my local system I just have 5 zipped folders. However in server we have about 1400+ zipped folders which is about 850GB data. In server I am running it as console application