I purchased a TK 102b gps tracker (after throwing away $25 on a lesser device) and it seemed to work great for about a week in testing. I still haven't flown it. However, now when I put the battery in, the green light just stays on forever (instead of turning off after 40 seconds of syncing, following by a blink every 4 seconds), and the unit no longer responds to any texts or calls. It worked fine, and then the next morning, steady green and no function. Any suggestions from the experts out there on how to fix this? I really like the idea of the security of a tracker on my Vision 2. I have an ATT sim card in there, and everything worked before.