Well, I plugged in the X50 to my car the other day while the car was already running, and it went thru the slow start up for some reason like this, laser,ka and then Self Cal. It would stay in Self Cal mode for quite sometime. Then go thru the power up mode, laser,ka, and then Self Cal. After a few times of this happening, I reset the unit but didn't do a thing for it to finally come out of Self Cal mode. I unplugged in and plugged it back in a few more times, and then finally Service Required came up on the display and it won't come off. Since most on here know how much great luck I have had w/ my "killer" X50 revision 5, I will be sending it in for repair . Alpinestars was the lucky one who got over 4 miles of detection w/ this X50 against C/O k band and got over 3 miles of it on video while driving in the snow :shock: . I hope Escort will come thru for me and fix my X50 "CORRECTLY" and not change the revision # 5 that I have. Question is, will I still have the same k band detection on this unit as I once had before?