Infinity stops responding since 2 days ago

Question

My Infinity service has functioned without any problems for about 2 years now. 
Suddenly a couple of days ago, the connection started dropping late in the evening, for no apparent reason.
Basically the VDSL link itself stays connected, but there is no connection to the outside world - no websites opening, no DNS resolution, no pings to internet IP addresses.
I reboot the router, the connection works fine for a while, then at some random point between 5 and 15 minutes later, it stops responding again.
This seems to happen late in the evening. I come home from work around 6pm, it seems to work until 8ish, then it starts behaving like this.
Is anyone else experiencing anything similar?
And by the way, when this happens, the Vision box reports that it is offline, no on-demand content works, but... the extra channels keep on working fine!

Answer 1

john46 wrote:
have you tried changing the DNS on your PC
No, I tried setting the router to use:
a) BT's DNS (i.e. those provided by BT's DHCP)
b) OpenDNS
On each occasion, all hosts were updated correctly with the appropriate DNS IPs (I checked to confirm). 
The dropout happened regardless.
I am waiting to see if it happens again. If it does I will try setting explicit DNS on my PC, but... that's not a solution as many other devices don't have that luxury (Vision box, network drives, TV, other people's phones etc).