I get the same problem with
http://www.bbc.co.uk/weather. A few seconds of nothing happening, then the cable modem re-boots. I have a Surfboard SB4100 modem and a Linksys BEFSR41 V2 router. Both have performed OK for years but a week or so ago this problem cropped up. If I bypass the router and connect directly via the modem there is no problem.