HR Concerns - It is inconsistent

I've had multiple issues with the wrist HR acting inconsistently at times.  Sometimes the HR will jump up 20bpm for as long as 4 mins before settling back down.  Other times, the HR will remain too low by up to 30bpm before suddenly jumping up to the correct HR.  I always wear my watch on the same wrist at the same tightness.  Here is an example where my HR increased and decreased by about 15bpm suddenly for about 1 min even though my pace or effort has not changed.

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