HRM run problems with Garmin 245M

Since few weeks I have a HRM run strap, but when I look at strava I see a lot of wrong information:

You see 2 big lines down, this was not because I stop running but because of problems with the strap!

I can send it back to the store where I buy, but this is normal with the HRM Run of is the HRM Dual better? 

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