My new Pro 78 has on two occasions has shown K band door openers as Ka band. This morning I was at Target and drove straight towards the door but the detector did not alert till about 50 feet and then it displayed Ka at 8 bars. Using City mode, Filter 1, POP off, Safety warning off. All bands are turned on. Mounted high and hard wired. I don't seem to be picking up K band door openers at all when driving by them on the roadway. I'm not very cofident wth my Pro 78 on K Band performance. Maybe I got a defective one.