Zigbee2mqtt: devices offline / failed to ping

Hello,
since today a lot of my zigbee devices are offline. i can not use my bulps and switches anymore. and i am not able to do the network map. It says “failed to ping” or “Error: ZCL command 0x001788010389984b/11 genOnOff.on({}”. I run the actual zigbee2mqtt version. I tryed other versions, I restarted a couple of time I even new installed zigbee2mqtt with new configuratoin.yaml. but it did not work. I could not find any help… also chatgpt did not help… someone facing the same issue?

z2m: Publish 'set' 'state' to 'zb2m_lightstrip_buero_tom' failed: 'Error: ZCL command 0x001788010d0e2d03/11 genOnOff.off({}, {"timeout":10000,"disableResponse":false,"disableRecovery":false,"disableDefaultResponse":false,"direction":0,"reservedBits":0,"writeUndiv":false}) failed (no response received (22) Error: waiting for response TIMEOUT)'

Some additional Information that may help:

I have Home Assistant Core 2025.2.5 running on a NUC 11. Zigbee runs via Conbee II (Hardware: ConBee2/RaspBee2 0x26720700).
The strange thing is that the green buttons (PTM 215ZE) work. Only the powered bulbs and flush-mounted actuators are offline… Ping doesn’t bother me, of course. But I can no longer switch the bulbs/lights on/off… which of course doesn’t make my wife very happy…