Ive just had a very similar problem with this oven. I have also noticed the food burning recently. This led me to suspect the temp was getting too high, possibly faulty thermostat. Ive checked it with an oven thermometer and found that set at 200 the actual temp reaches 240 then shortly after power cuts out. This has to be a thermal cutout protection kicking in, as the power resumes once its cooled. Thats where im up to. Considering getting hotpoint to check it.
mike
June 2010