Hi Michael, I have been seeing the same issues as well.
They were discussed briefly in this thread: RFD900x-TxMod for Taranis X9D and Horus X12S with Telemetry. As a temporary work around we disabled telemetry alarms in the opentx menu to stop the “telemetry lost” and “telemetry recovered” messages. Then we went in an put blank audio files in place of the “motors armed” and “motors disarmed” messages. Then we set two edge triggers that play custom “signal lost” and “signal recovered” messages based on losing or acquiring the GPS sensor (s.port). It’s not pretty but it works for now.