Could be a couple things. If your machine is actually failing either a control board or an oven sensor.
Also measuring the temperature can only be done by a tech unless you have a special tool. Oven thermometers are inaccurate. Plus most ranges should vary temp between 50-75 degrees unless has a feature or the more recent ones keep it between 15-25 degrees.
Try the biscuit test, buy some biscuit, brand not important, i just say pillsbury. Cook exactly as recommended on package. If results are a little overcooked or a bit undercook try a feature called Adjusting the oven temperature or Calibrating the oven. This can be done by following the instructions in your book.
Maytag.com click support click manuals put in model MER5775QA (notice i took off your models S) open the Use guide, page 14
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When I turn the lower oven on to bake at 350 degrees, it will actually heat up to 425 degrees
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