'The translation memory or TM container appears to be missing and may have been deleted' error

Hello,

My SDL Trados 2019 is in French but I prefer to send my message in English to accelerate the process if possible.

So when translating a document with a TM, once in a while, and suddenly for no reason, I receive this message 

'The translation memory or TM container appears to be missing and may have been deleted' error

It almost always happen at the end of my document, so then I cannot continue the translation and cannot save the file (Fichier indépendant introuvable/Independent file not found and Fichier source introuvable/Source file not found). I tried to reinitialize SDL but it did not change anything. It's very annoying because you cannot trust Trados as it can crash anytime when you are in the middle of your work. How can I fix that once and for all ASAP?

I think you have already my email, but in case it's roy61@videotreon.ca

Thanks

André Roy, M.A. trad., certified translator