After updating to the v4.6.2 firmware, the router is completely unstable, crashing every day, AdGuard not working, or when working is not blocking anything, not even custom domains etc.
I reverted back without keeping the settings to v4.5 and everything works fin now as it did before for months.

Did you upgrade without keeping the settings as well?

i don't remember, not sure and i will keep the old firmware that worked fine