I have a Yaesu FTM-350R that is used as a backup rig in my radio room and it has been working fine up until the other day when it randomly developed an issue. The receive signal strength on the "Main" band is all of the sudden very low and the receive signal on the "Sub" band is normal. It doesn't matter if I select the right or left side, UHF or VHF, the "Main" band RX is always low compared to the "Sub" band. I have tried different antennas, different coax, and even did a master reset and still get the same results. Looking through the menus I don't see an RF gain of any kind. Anyone else had an issue like this? Suggestions before I send it in?