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Intensity minutes recording more minutes than real

On my 735xt I used to record correctly the intensity minutes, suddenly it stops recording the step counting and any intensity minute after a workout. 

I reset the watch and started recording the steps and the intensity minutes after a workout but the intensity minutes started recording much more that real. 

Today I ran 10 min and recorded a total of 31 min (8 moderate + 23 min intensive x2= 54 min). the watch is not recording correctly the total min.

Any idea how to fix this?