Hi. I think i had same problem as you, i.e. my brother. He has 3 Xiaomi 4A GE in Mesh and the Mesh gateway is connected to ISP router and sends 2,4GHz WLAN. Mesh is on 5GHz. After updating from 22.03.6 to 23.05.02 (same as your version) he expirienced some issue (Inaccessable LUCI, very slow SSH and of course no internet connection). Those issues would suggest there is some OOM problems with 23.05.2 version.
We upgraded all 3 routers to snapshot from 21-03-2024 and there were no OOM issues anymore, but some other issues that make some nodes of the mesh inaccessable (There is some other problem, i have to investigate).
You can try 22.03 series and i am sure it will work really great. I have only good expirience with this model. We had 90+ uptime days with those releases.
We upgraded now to 23.05.3 and we will see if it is any better. I hope someone from dev is going to see this. I have one 4AGE running on 23.05.2 on my own mesh and waiting for it to crash, then i can post some dmesg messages and more details.
Best regards