I'm just curious because I find it hard to believe that avionics in combat aircraft are or were so unreliable that they would have to be restarted every few hou

I'm just curious because I find it hard to believe that avionics in combat aircraft are or were so unreliable that they would have to be restarted every few hours. That would not work for e.g. bombers on long missions, fighters on CAP, etc. I can just imagine a pilot thinking, "Okay, we're about to cross the FLOT and I've got 20 minutes until the next avionics reboot. I'd better go ahead and reboot it now before we run into trouble..."