Salus it600 integration weakens zigbee signal?

hello, i have salus ug600 gateway paired with sq610 thermostat. while alone and using only salus mobile app everything is long-term steady, signal strength -75dBm. but after succesfully integrating with HA via hacs/it600 and getting some data, signal strength goes down (gateway is connected via ethernet cable, zigbee channel 25 looks god with no overcrowd) to -88dBm and there are many outages during the day. after disabling HA integration, signal goes back to 75 level. how is that possible and can i somehow get this fixed with some HA setting like lowering communication interval between HA and gateway or something like that? thanks for any tip.