Hey, a few days ago, I bought an Escort 8500 x50 blue from ebay. It was from a powerseller with thousands of sales and great feedback so it seemed fine. The detector was even sealed too. My question is, should I ask him to send me a new one. I have been testing it out the past few days. I have seen about 20 speed traps where the detector went off one time. This was within 10 feet of the cop. Last night, on two seperate occasions, I had cops behind me. Didn't hear a peep from the radar. I live in NJ. Any ideas on what could be wrong? I know cops use instant on, but I mean near the speed traps, many cars were around.