Disappearing (Deleted) Track

It’s happened twice now.
I’ll be working on a project, and suddenly, a track disappears.
Yesterday, I thought maybe a hit a wrong key on my keyboard. I checked to see if it was simply hidden - Nope.
Today, I was recording a bass line. I was re-doing takes, so I hit the Record button on my ProjectMix control surface each time I would re-do the take. Around the third take, suddenly the track I was recording on disappeared. Again, not hidden - Gone.

Anyone else?

FYI - Ver 9.5