New boat issue - what's your diagnosis?

This one may be hard to explain, but I'll do my best. Note - I am taking the boat to the dealership Monday morning, but I'm stumped and curious to see what the knowledge here can diagnose blindly!

Boat now has 12.6 hours. We did the normal break in (this is our second new boat). Somewhere between hours 5 and 6 while running around 3k RPM (guesstimate) the boat just "went dead" as if someone had turned the key off. All gauges went to zero. This lasted a second or so, then it picked back up where it left off as if nothing happened. It troubled me, but I made a note and kept going.

Somewhere between 7-9 hours this happened again. Same exact thing, but at different RPM and speed. This time it was around 10mph or so, as we were messing around with surf ballast.

Fast forward to today. First time we had a group with us (8 total). Somewhere between 10.5 and 11.5 hours it happened again, but this time it completely died and I had to restart with key. All oil pressure, temperature, and voltage was normal. Checked oil and fluids. Over the course of the next 1-2 hours it happened 3 or 4 more times. Each one was at various speeds, some while cruise was on, some while cruise was not engaged.

Now I am a bit ticked off, but also know that these things happen so I have no ill will toward the boat manufacturer or the dealership. Plus I know they will take care of it as my dealer is solid. I do have to admit that it probably was a bit embarrassing more than anything with a boat full of friends that I'm trying to show off my new boat to.

So does anyone have any thoughts? My gut tells me it's definitely electrical, otherwise all the gauges wouldn't die simultaneously. Could it be a bad battery connection, some wire arcing, etc? Don't know really where to start, and will definitely let the dealer handle it.