I have had this detector 2 years and the self calibration has been bombing out for the past 6 months. I have no interest in sending it in. Does anyone know the fix for the detector? I may break it open and fix it if I know which direction to go inside; otherwise, I'll likely trash it and buy another, different brand. I have read some on the V-1. I hard wired the 8500 detector about 6 months after purchasing. Is there any truth to hardwiring causing this problem or is it just a defective detector? Thanks.