Undo suddenly stops working

I’m still trying to find a common factor here but I’ve noticed that at certain points, Undo will cease to function. Meaning nothing is being added to the undo history. It doesn’t just stop adding however, the entire history is missing. Option is greyed out. Something that always happens at the same time is I’m unable to select any track automation points for editing. I think it happens more often when I’m switching between two active projects but I’ve seen the same behavior after just working for some time on a single project. Restarting the app solves the issue. I have one colleague who is reporting the same bug.