SENSORS CONECTION PROBLEMS

Hi I have 540 for six months. Occasionally when I power it on it doesnt find any of my sensors (heart rate garmin, power meter garmin pedals, DI2 ultegra12s).

Last time it happend I powered it off (not sleep) turn it on again and found all the sensors.

But the power meter gone crazy. It was connecting and disconnecting all the time. And the measurements are unreal. 3500 watts.

I have 2 bikes that I use the garmin 540 and pedals. The one with dI2 and one with mechanical shiffting.

I think that the problems occures when I used them with the dI2.

Is it possible that this is the problem?

If so, how so I solve it?