Hello, purchased an XR15 that was upgraded to a G6 about a year ago. Recently, it's been shutting off. If I unplug and replug the power adapter, it turns back on and an hour later shuts down again. I tried different power adapters from my other XR15 but still shuts down. The fan appears to be working. Thoughts on how to resolve? How long to radions usually last? TIA.