98 CRV Just Quit

My wife was driving our 'V a couple of days ago and while going about 40 mph everything but the stereo suddenly shut down... engine, gauges, turn signals, etc. She turned the car off then back on and everything went back to normal, and ran fine.
Since it all imediately went back to normal it doesn't sound like an alternator or battery, and the ground is good (figured it was anyway since the radio stayed on).
So, what could have come loose that would affect all (or most; some things weren't on, like the headlights) of the electrical system except for the stereo?
Also, I'm curious if this is in any way related to a P0301 code (cyl #1 missfire) that I have been troubleshooting that seems to be electrical in nature as well (yes, the valves are fine). I'm wondering if there might be an intermittent open that could affect the ignition and have been causing these missfires as well as this sudden shut-down? Whatever this most recent episode was, however, it did not trigger a code.

The "shut down" problem could possibly have been an ignition switch contact assembly problem. It's the electric switch that is attached to the end of the ignition key tumbler, and they tend to get worn out over the years. Just something to check. As far as the misfires, it's common with a lot of CR-Vs that have been neglected or have had poor quality parts installed. An ignition tune-up (distributor cap & rotor, plugs, wires) with all OEM parts usually takes care of this.
Another thing is to make sure there is no oil leaking into the spark plug wells through the valve cover seals, or water that has entered while washing the engine bay. These will also cause a misfire.
While you're at it, might as well complete the rest of the tune-up as well (fuel filter, air filter, PCV valve). You can check out parts at my regular dealer. I commend them for great service and fast shipping. Honda Parts: Link removed by Moderator - spam.