Motion Sensors - Going to sleep?

Not sure the exact issue but I have 2 motion sensor I got online, they was cheap so have a feeling this is my overall answer.

They are _TZ3000_o4mkahkc model, now I have these setup one at the top and bottom of the stairs to turn on/off an LED strip.

However, the issue seems to be after 4/5 hours roughly they just stop communicating. Stop reporting into HA and stop detecting motion, if I remove the batteries and put them back in, or press the reset button they immediately work again for a few hours?

Any ideas? Are they going to sleep? Batteries are brand new, reporting 100% and I have tried multiple ones?

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Just to double post my own thread same thing again 4/5 hours then stops - I walk past them and a red light goes off ti say they have detected motion but they just sat as unavailable within HA?

I’ve other signee devices closer and further from the hub and no issues