Hello Ata Arif

Is this happening for the same file / project on both computers? Are the files / projects you`re working on saved on a shared drive? If yes, please try to copy them locally on the PCs and see it it still crashes.  

Thank you,

Sorin

Thank you for your answer, I thought it was with a specific file but it appeared it was for all. Now I have tried to repair SDL on both machines and updated both machines from windows update (although I have automatic update switched on!) and tried again but that doe not help. when I start the Studio it starts normally, when I start to translate a new segment as soon as I jump there it freezes for a few seconds and crashes. yes, I use One drive and have been using it for ages with no such issues. 

Hello Ata Arif

Can you try to work with 1-2 files locally and not from One Drive to see if it still crashes? There could be some syncronization issues with One Drive which causes this issue.

Thank you,

Sorin

Now I saved a copy of the TM on the hard disk of my PC and cleared a new file without adding any TB and after two to three segments it crashed again same result 

I did same rusult 

now with an error message saying

Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

Ata Arif We will be pleased to help you with this problem so have logged a support case on your behalf. You will be contacted at the email address used for this Community. Support Case Id : 00660088 .

Thank you very much 

Update

thank you for your care, my problem has now been solved through some steps I have taken
I have repaired my TM through the free app 
I have reorganised my TB 
I have carried out the necessary performance in my TM
and now my studio works the same as before, hope it will continue!
my guess for this issue is using a client's project and joining my TM with it at the same time, maybe or maybe not!
Thank you again