Well its not easy to advise when you haven't mentioned what the model number is of the device causing the problem, however as there are many things that can cause this its a case of whether or not you see any error code numbers mentioned? as this can give a pointer as to where the problem is. If by any chance its a "D" model followed by three numerals these are notorious for this happening, with unfortunately no fixed single reason responsible which means a more time consuming diagnostic task.

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