Tracks keep cutting out

I’ve been using Cubase LE Ai Elements 8 for a year now, but since last month tracks started cutting out out of nowhere.
I really don’t know what caused this. First i thought that it was because of my buffer size but it doesnt seem that way.

And it doesn’t just happen for only one project, it happens with every project even ones that used too work fine.

Does someone know a solution too this problem? i used too make music everyday ;w;

Thank you

Im on a mac btw