It's a weird annoying issue the past few weeks, After or during downloading large game files on my PS4 or video files on my PC I come back and find my internet is disconnected!
It's done it a few times now, the last time was yesterday and rebooting the router or leaving it turned off a while didn't help. I just left it off overnight and connected again this morning and everything seems fine again. I use a netgear D6400, but tried my HG633 and had the same problem on that also.
The line is stable otherwise.