After upgrade to the new firmware the router sometimes failing with a connection

I'm gonna chime in and say that I've also had issues with the altest firmware for this router, and that manually downgrading it back tot he previous firmware (and turning off auto-updates) has made it stable again.

In my case, IPv6 kept dropping out on the router, requiring that I either reboot the router every coule of hours, or turn of IPv6 support completely. When I downloaded and installed V1.0.3.88_1.0.41 manually, things stablizized and IPv6 worked wiothout any problems again.

Hopefully they fix this in a newer firmware.  But I wuold definitely avoud 1.0.3.98_1.0.46, and if you have it installed, downgrade if you can.