Zyxel M1 Multy Satellite turns to red and you have to reset - why?

Hi, i have 1 primary multy and 1 satellite. It works fine with between 100-200 Mbit, but after x time it turns to red and i have to reset it. I didnt change anything in network and there wasnt any restarts or power outage. So simple it should be working but cant do this simple thing. Can u please help why is turning to red as well? Satellit is appr 7 meters from primary, there is building only from simple wood, backhaul was also perfect.