You may have inadvertently pressed the Function kob and the 1 button which put the scanner into Public Safety Search. That's probably what Search Key 1 has been assigned.
If you don't wish to do Quick Searching, you could get into your scanner programming software and use either the Configuration Editor (ARC) or Set Scanner Options (FreeScan) and clear the Search Keys (as in not to search any band). Then program the revision to your scanner. That would lessen the possibility of this issue repeating itself.
Doing the "Reset to Factory" is a nuclear option. It has its place, usually after everything else fails. That's because you have to, as you noted above, have to re-program all your systems. Plus you still have those search keys assigned, just waiting for the inadvertent presses.