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.
Anyone else run into this?
[Aqara leak sensors stopped workin* April 2024]
Sorry I can’t help on this one, but my sense of humor got the best of me - I’m replying and bookmarking to come back in a year to see if you are psychic and my leak sensors go offline or not. /s
On a serious note, I hope you find the solution. I’m surfing tonight trying to find out why a bunch of my Aeotec Z-wave switches have been acting unresponsive the last few days.
Hey wasn’t me (OP). 
One of the mods moved my post from another thread into its own and they made the typo 
Meanwhile I fixed the title, plus with respect to my leak sensors, I was finally able to get one of them working by re-pair it, but it showed up as a new device for some reason when I did this.
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.
Anyone else still having issues with these? I just bought a 3-pack of the SJCGQ11LM Aqara sensors a little over a month ago. They were a bear to get added, but I was finally successful. I’m using the Mariano Zigbee Moisture sensor driver. Since I first installed them, they all go offline randomly (same as my Zwave leak sensors) but these don’t come back. This week will be the 3rd time have had to delete them an re-add them. I’ve been reluctant to use Aqara devices and these aren’t helping with what I now believe to be a bad purchase. I see in the above posts that repeaters fixed someone else’s issue, but that’s not the case with me. I have a repeater within 3’ one of these sensors. I know that repeater is working, because when it’s not, the window shades in that room won’t function on schedule.