My fireplace has worked great until recently. When I turn it on, it works fine for awhile, then the `fan just kicks off. If I turn the fireplace off for awhile and then restart it, the fan works again for a time but kicks off again. I have read posts that some people have found loose wires behind the fireplace. Could this be my problem? It doesn't seem to be getting overly hot. Any suggestions? I plan on pulling the fireplace in the next few days. Thanks for your help!