factory reset itself

Today I woke up at night and noticed that many of my smart devices lost the wifi connection. I though maybe the router frozen and need a restart (sometimes happens because of Transmission's heavy load). But no. First time ever the router reset itself. Checked the external jffs drive and the...

For over 3 years have been running AX88U (all firmware regularly updated) connected to ISP and using AIMesh (wired) to 2 x AX68U routers. I have it scheduled to reboot every night. This morning, I had no internet. Then realised the issue was actually the 88U could not connect to ISP...