which firmware version ? 4.5.6 has been solid for me 99% of the time.
The thing that helped is that after I upgraded to 4.5.6 from older beta, I did reset the router and entered all the info again from scratch.
from 4.5.5 to 4.5.7 Beta it appeared in everyone.
i turned off Adguard since 2 Days now, no crashes until now. im still try to find out whats the cause is.
How many lists do you use in AGH?