Vexira
Part of the Furniture
I'm aware of nvram, power cycling electronics can help, I Ahve my router set to a reboot cycle of once a day at 4am to prevent issue, that I used to have with the unit. Mainly upnp leases not clearing correctly and a few other prefomance related problems.this devices have NVRAM, NV=non volatile, that means they wont forget, not in 1 second nor in 1 year, so it really makes no sense to turn of 30s or similar precedures 30-30-30 or whatever is wroten anywhere.
let it turned on an press reset button or turn off (as long as you're comftable) and hold WPS while turning on.
It can be a difference how long you press one or the other button, but not how long to turn it off!
Also you forgot they have standard dram if they can't forget then please explain why cutting the power to the unit causes the time to be lost and a re sync is required.
Factory reset is a last resort, 9/10 times power cycles of even up to 30 minutes can help with such issues.