ANT+ Problem Garmin Rally

I have a problem with the ANT+ pairing on my karoo2. It shows me a lot lower battery status, I cannot calibrate the pedal cause of time out, and it looses connection when not pedaling. When not pedaling it shows „searching“, after a few rotations it connects and shows data.

when connected via Bluetooth everything looks fine also battery is full.

all firmwares are on the latest version