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Many vehicles have built in signals that radar detectors see as a laser radar. Basically there is no way around it. On my vehicles that emit this signal, I just disabled laser detection on the radar detector.
If your radar detector detects laser you are pretty much effed anyway. The time in capturing a speed reading is less than half a second with laser.
Beltronics is now using a special "high temperature" speaker which resolves issues with speakers blowing due to high ambient temperatures. Contact Beltronics and schedule service for your V940. Not only will Bel replace the speaker with the newer model, but they will also test and calibrate your V940 and install whatever the current firmware is for your V940.
This is caused by the RD's local oscillator becoming unstable at higher temperatures due to a component which has become defective. Since this is an older radar detector model, you will have to pay a service charge to have it fixed. On the other hand, perhaps it is time to upgrade your remote installation to either the Escort 9500ci or the Bel STi-R setups? These newer models from Bel/Escort provide much better performance.
This is a somewhat common problem that occurs when a strong voltage spike while starting your car damages the radar detector. Bel can fix your RD. Once you get it back, always start your car first before powering on your radar detector. Likewise, power off your radar detector before turning off your car's ignition.