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by going off do you mean alerting you or is the power turning off if it is alerting you you may have electronic interference in the car if the power is going off it may be as simple as a short in the power cord cobra 773-889-3087 sells then for 10.00 or you can trade your old detector to them and get the next highest model at a discounted price
Of note, this extremely inexpensive radar detector provides just about the worst performance of any radar detector product currently available from any RD manufacturer. I suggest that you visit radardetector.net to learn more about radar detectors.
This is caused by electrical noise in your car's electrical system. Specifically, the problem is excessive alternator whine. This can be exacerbated by somewhat corroded contacts in your car's cigarette lighter socket or by a somewhat corroded vehicle wiring connection to the back side of the cigarette lighter socket.
One potential solution is to try a snap-on RF filter which is available at your local Radio Shack. You would snap this filter around the positive 12V wire leading to your car's cigarette lighter socket. Preferably, if there is enough free slack in the 12V wire leading to the cigarette lighter socket, you would wrap this wire through the RF filter twice before snapping the RF filter closed around the wire.