I too am having problems with my Aquara leak sensor. I have 3, and they were working fine using edge drivers until the last few days. Now all three are showing as offline, even if I physically push the button on them and/or put them in water.
And since they are offline, when I try to view the driver info in the smartthings app, the driver setting is greyed out. Plus I can no longer seem to repair them.
I have 11 leak sensors total. 6 are Aqara. I also have 2 Aqara temp humidity sensors. Over the last 6 months a few have gone offline.
Through trial and error, I’ve been able to determine I needed a ZigBee device closer to where a couple leak sensors would go offline. So far the problem is fixed. When they do go offline, I simply delete the device and repair and it comes back, name and all. I just have to move it back to it’s room. The temp and humidity sensors are more of a pain because I’m using them in a routine.