All of a sudden, my TH9X transmitter (stock Iris+) starting sounding a constant high-pitched tone when the Iris+ is plugged in. I actually think the alarm (?) is coming from the frSky DJT module on the transmitter.
I've tried new batteries in the transmitter with a full charged battery on the Iris+. I've looked in the Iris+ and all seems okay and plugged in. I do get the TX and RX to bind just fine Even with the alarm, the Iris+ will arm and thrust can be added (tested without props). This is on a 2 week old Iris+ with 5 previous flights with no problems.
I've looked in many places, but cant find or get an answer. What does this steady tone mean and what do I need to do?