What hub are you trying to get the sensors to work on? C7 c8 or?
Here's a recent quick summary of my experience with Aqara devices that I recently posted.
TL;DR They can be very difficult to make work, and once you make them work it can be unclear, if they start having problems, what the difference is.
Have you added any other mains powered zigbee devices recently? I had some issues when I added a motion sensor. Several Aqara contact sensors kept dropping off the hub repeatedly. I moved the motion sensor to a different hub, and my problems went away. The sensor was Mains powered and worked as a repeater as well. I didn't do enough testing to really positively confirm the motion sensor was the problem, but removing it did clear up my issues. I've had ongoing general problems w/Zigbee devices for months (hopefully finaly clearing up now) but in that time my Aqara contact sensors have been more reliable on my C8 overall than traditional Visonic contacts and Iris motions. So go figure...