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Likewise. Have had the Z for just over a year and have never had a problem with my 8500. I don't know how long you've had it but the 8500 comes with a one year warranty. See if it works in another vehicle. If not, you should get Escort to have a look at it. If it does, if you've made any mods that tapped into you're electrical system, you should probably check them out.
I have had the detector for quite a while and never had a problem with it in any of my other cars, this problem started before I did any mods to the car.