Sidney Endon-Lee formulated on Friday :
If you are sufficiently 'techie', you might wish to try putting OpenWrt on
it.

https://openwrt.org/toh/tp-link/tl-wdr3600

Seconded...

I have that on my main router, which is ex-BT and it is absolutely rock
stable. It remains connected for years without issue, but it is quite
easy to add a line of code to have it reboot once per day/week.