Contact sensors battery drain

Certain Iris sensors drain battery within weeks. Any idea why?

It seems to be location dependent, not device dependent. All devices are within 30ft of the hub or smart plug. Have rebuilt zigbee mesh multiple times, did not make any difference.

Have you tried another Iris sensor there? I’ve had a bad Iris motion se sir that did the same. Returned it and the new one was fine.

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yes that’s what I mean by not device dependent (another sensor in those locations behaves the same)

In that case sounds like that spot has a weak mesh. Add a repeater near by. Iris 3210-L plug works well.