First things first: It’s Aqara, not AqUara. If you fix the spelling, people searching for issues with these devices are more likely to find your thread.
Secondly: your issues are almost certainly because you have interference or not enough routers. Read this to understand how zigbee works, and why end-devices like your window sensors require zigbee routers if they’re too far away from your coordinator.
Third: check the batteries on those things. Even if they’re “new”, they could have been sitting on a shelf for a couple of years. The power outage reporting 27 could be an indication of either a failing battery or the issues I mentioned in point 2 above.