i have been using 3 xiaomi gateways successfully for a long time. since about 4 weeks there are always two gateways offline, only 1 gateway is working at the same time. 2 bridges are always offline.
Individually I can run all 3 gateways, but not together (if I set 2 gateways to disable in the paper ui).
what i did once again is an openhab update from version 2.5.1 to 2.5.4