Microwave GE Profile shuts off after 10-20 seconds on any setting, vents are all clear, had just installed new HD 3D tv and Blue Ray Wifi DVD player about 15 feet away, unplugged both to make sure they were not interfering. Is this worth a service call? If I set is 4-5 times in a row and get 10-15 seconds out of it each time it will barely heat water in a glass.