I bought a used BCT8 on eBay a month or two ago. This is my third BCT8 and I have no problems with the first two. After a while working correctly, the scanner now has trouble playing the audio it picks up. Sometimes it is broken and almost sounds like it's underwater, and sometimes no sound is audible at all when it stops on an active talkgroup. Does anyone have any suggestions to fix it, or am I better of getting a new one?