I know they used to, at least internally. But I think they stopped doing this a long time ago once ADSL routers flooded in from all sorts of places. My knowledge of routers that caused problems used to be pretty good, but it is getting less and less relevant now.

I would suggest that next time you have a problems like this, preferably one that repeats, to replace the router with a different brand before reporting to BT and see if the problem goes away. If it does it could be likely that you have an incompatibility going on.

As for the old BT routers blowing up all the time, that kept me fed and watered and in good overtime for a couple of years, loved those jobs

Cheers

Cris.