I'm curious to know if anything is written to flash when the router reboots. Repeatedly writing to flash memory does wear it out eventually. But just reading from flash does not significantly impact MTBF as far as I know. Rebooting will surely place very little stress on the other components. The power supply is already up and running at a stable temperature, so no inrush current stress or thermal cycling stress to worry about. But writing to flash every day, that could be a worry.Daily reboots for no reason put more wear and tear on the routers' components.
Can hide underlying issues.
Isn't needed in any well-functioning network.
I ask as a user who has a daily reboot scheduled on the family router, reason being just in case it gets its knickers in a noodle while I am away from home. Family gets very upset when "the internet is broken" - which is mostly caused by ISP service outages, not a messed up router. However, possible messed up router scenarios I am seeking to mitigate with the nightly reboot would be "malicious packets" running into an unpatched security vulnerability and hanging a process, or a bug in this otherwise excellent firmware that escaped testing. In nearly 4 years of running asuswrt-merlin with nightly scheduled reboots, this router has only needed manually power cycling to restart messed up wireless a couple of times. But now I'm worried about wearing out the flash memory. Is that where the system log is written? Can anyone please advise?