I develop almost exclusively on a single project, so it went from never happening for it, to happening frequently. It became clear to me that something had changed when it happened three times yesterday, and I only worked a couple of hours. I can start making a log of when it happens and under what conditions. It would be hard for me to try working in a different project, since I develop full time on my current one. I could try to work on my next feature in a new project, and then port it back to my app, if that would lead to important information.