'Sharp' over stove convection/microwave oven problems

Well, we did make a trip to Alabama so my wife could experience the ocean/beaches, and one stretch of road literally beat our rig with jackhammers. Suppose that might be the problem, but we have used it since the time without problems. As mentioned, this came on rather suddenly, one use to the next. Guess I'll have to get it checked out at Abe's RV Repair and see what the verdict is. Thank you.