Some of the projects not working

Hey!
I have a problem. Some of the projects start to glitch after a day or two of working.
However, I’m just using midi, same instruments, same plugins, nothing new added.
I can’t understand why does this happens. Same project, same plugins, but it starts to glith.
Same thing with a mixing sessions. I do mixing with plugins, everything is ok and after working for about 5 hours project starts to crackle. However I’m just doing balances and I’m not adding new plugins after 2 nd hour of session!

But the main thing, that not every project have these issues, And this is really strange!