L/R balance and power issue Rally RK200

L/R balance and power issue.Rally RK200.

Balance issue, right side appears to be OK but left side fluctuate and drops to 0.

Hello,

It appears that this is a common problem with these garmin power pedals. 

I've tried just about everything, new battery's, new battery kit,  full service, re-torqued, latest firmware, disconnect from edge 540 and phone and reconnect, NO connection issues, calibrated before each ride, crank measurement is correct.

Everything was working fine for the first 2 years till a few months after the 2nd year so looks like garmin warranty is not an option.