Sonoff ZBMINI Zigbee Switch pairing problem

I succesfully use OH2.5.11 with Bitron Video Zigbee coordinator. I try to pair a new Zigbee ZBMINI switch and the system recognizes it but cannot operate it: when I press the physical switch it worsk but does not give feedback to OH and when I activate it on OH it does nothing. It also disconnects and goes offline very frequenty even if it’s near the zigbee coordinator. I use othe Sonoff Zigbee devices (door sensors) and have no problems.
Anyone can help or has similar experience?
best regards ant thank you in advance