My Taranis XD9 plus (OpenTX 2.0.15) is suddenly not recognized via USB. Until recently, I successfully used the USB for mass storage and to play the sim. But during the sim the other day, I heard the sound of the USB connection being lost and restored, and sometimes the signal would get stuck and I'd crash while flying. I tried with some success unplugging and plugging it back in, but eventually the radio device stopped being recognized altogether. The radio display showed an exclamation mark in the top right when it began to seriously fail, but now that's gone and it shows the USB icon when plugged in. The plug doesn't look damaged based on internal and external inspection. I've tried three different cables and three different machines (2 Windows, 1 Ubuntu). Those same cables work with other storage devices. Anyone experienced this? Searched the forums but no solutions. I'm afraid it's the radio.