Heart Rate - odd running results

Sometimes when I run outside my heart rate will spike up into the 180 or 190s for no reason.  It will come back down to the 140s if I stop but then if I start again it goes back up.  If I take the watch off and clean the sensor and my wrist I then get a very low heart rate for the rest of the run 70s or 80s mostly (but as high as 100). My normal heart rate for these runs should be @140 bpm.  Has anyone experienced this or do you know of any fixes?

Thanks 

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