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Possible issue with HRM run

So I'm wondering if I have an issue with my HRM Run. It doesn't seem to be doing a consistent running dynamics i.e found contact time etc.. I'm having a hard time figuring out if this is an issue with my 5+ or with the chest strap. It doesn't seem to be losing my heart rate just the advance running dynamics. It seems to record it for the first 4-5 minutes then nothing. It doesn't show any breaks in heart rate. I'm very confused.