williamcopper
It's my pleasure to be here on the forum with this advice because of a recent crash, losing a couple hours of painstaking work, from exactly this kind of bug in Sonar.
You keep mentioning losing hours of painstaking work. You
really should save periodically.
When I first started using computers back in the days of CP/M and 8" floppies, I asked a computer guru how often I should save. His answer was "any time you have something you don't want to lose." That advice has served me
very well for close to four decades.
Ctrl+S takes under a second, "Save As..." a little longer.