I am also having problems with a Maytag dishwasher, although different from yours. However, while searching for information, I learned of a recall of about 1.7 million Maytag dishwashers for a serious fire risk. I do not have all the details, but it is related to the heater element.
Do a search and enter your model and serial number to see if your unit is on recall list. If so, Maytag offers to repair the problem or provide a rebate if you buy a replacement Maytag unit.

Good Luck