Toon Boom just closes and loses all saved work

Hi everyone

I do some of the tech stuff in the studio I work at and we have been having a strange problem sometimes.

On the one PC when you are working in Toon Boom it would just close out of no where then when you reopen the file again all the work done in it is gone as most like it reset the scene back to when it was first made even if you have saved and reopened the file many time before with no problems and even the auto save files have been reset.

It’s a huge problem, does anyone know what’s happening here.