I have a Bosch refirigerator three and a half years old. The refigerator reaches its set temperature, goes off, then does not start again when the temperaure drops. I have tried switching the power plug off and switching it on again. Sometimes nothing happens. I have tried switching the power plug switch on and off several times and this sometimes works. The refrigerator cools efficiently once it is in action again. Is this a a switch/dial problem , or a thermostat problem? The compressor sounds ok. Just wondered if anyone else had come acros this problem.