Float panel has > 10 sec reaction time (Deconz - Conbee II)

Hi, weird thing - I suspect it’s a hardware issue. I have a float panel tht has been working perfectly for years and since 3 updates ago (not 100% sure which) it’s very slow to respond. I have 30 other devices in the house and other float panels that work fine. But this one takes more than 10sec to respond - even if I use the deconz interface.

Any suggestions? (I tried re-pairing already)