965 Cadence drops by half which causing the loss of running power and stride error. Current software version: 23.20

Need help, cadence drops by half causing the loss of running power and stride error. This have been happened since april 22nd until now. 

Is this a bug on this software version?

I didn't use any external accessories, only my 965 watch. 

This was my ran on april 22nd

May 8th

June 5th