In the meantime, while you do all of the above, file a warranty claim with Thor. As far as you know you have defective radio. Get it documented ASAP. If it needs to be replaced it may be months anyway?
2019 Sunstar 29VE Sumo Springs; Safe T Plus; EC-30 AGS; Vmax 250ah AGM; T-Mobile Internet w/WiFi6; H/W Heater / Chassis Disconnect Switches; Southwire Surge Guard 44270 & 34951 w/Monitor 40301; Jet Flo Macerator; Alpine SPE500 Speakers; Visio M21D-H8R