Hello. I use my sti driver to travel on long roads. I noticed it did't pick any K and KA band signal after two houres of driving or more. To verify my doubt, i asked to a police officer, my brother in law, to mae the test for me. He conneted my STI during 2.5 houres in is own car, than did the test with is own KA band patrol car radar. the sti did't pick the band. So, i called Beltronics Canada and they told me they was surprise of it. But, they said they certainly can fix the problem, probably my the new firmware(software).My unit was bought two month ago from an authorized dealer, but the serial are 1507. Let me know if you experienced something similar.