Multiple watchport humidity sensor error

I’m using watchport/H/T combo sensors to monitor medicals devices cabinets environmental parameters.

Since some time I receive many humidity “sensor error” but at the same time the temperature sensor is running & reporting temp. correcty.

If I move the whole sensor module around, it suddenly start to report humidity correctly.

If I put it back to the initial place, it start again to report errors.

This behavior happens with any new watchport/H/T.

I suspect the humidity sensor path exhibit sensitivity to some external perturbation.

But where to look first ?