Just had an issue that just started tonight. My Anytone 6666 had the carrier just drop almost completely out, but the modulation is working. I can communicate on AM just fine, but if I keep it keyed down, the carrier drops down to almost nothing. I wasn't paying attention to my meter and started noticing my amp had started chattering. Turned the amp off and seen I had almost no carrier. This is with the RF power all the way up. Before at about halfway up on the RF power, I would have a little over a 3 watt DK. What could cause a radio to have modulation, but have a little to no carrier on AM??