Help! S-800 drops altitude, white lights!

Help, I'm flying my S-800 with WKM 5.20, Zenmuse, Secraft retracts and I am getting white leds flashing and a loss of altitude but only when flying backwards??? Forward flight is good, but if I fly backwards it starts to drop altitude quickly. It never did this before and I'm wondering if I should downgrade firmware or do I have a bad IMU all of a sudden?

Thanks!
 


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