Microwave buttons

read the directions, some need to press "cook" or something before the numbers or other combinations. looks like "express cook" and ringed numbers 1 thru 6. should be able to just push one of those and it starts automatically. hopefully you have a cup of water in it before trying to start it.
bumpy

I'm plugged in to a 30 amp circuit at camp driveway.

May not be related, but our MW works just fine on shore power but when the gen is running, the buttons don't work unless I have the AC or other high energy draw appliance running.

Have not had that issue with our "High Pointe" brand microwave, but it is a fairly standard size among built-in RV microwaves, I don't think you (or I when that day comes) would have much trouble finding one to replace it.

When ours goes, I plan on getting one that is a "convection" microwave, so we could do some baking in it since our RV has no LP oven.

Don't have that issue but you probably need to replace the keypad.