I have the same problem started yesterday. I am running on standard broadband with a fiber router. After going through 4 Bright? Boxes in one year, I said a fiber router or I am leaving. First time it has gone wrong in 2 years.
Looks to me like its dying on me, hope I don't need to threaten to move if they don't replace it again!
If you would like help with your BB speed or connection issues, please would you carry out the following steps for starters, which will enable us to diagnose the problem and advise you further. Do not restart your router to do these tests:
1. Post your full router stats.
For a BrightBox: login and go to Advanced Settings/ System/ DSL Status. Also post 'System Uptime' from top of System Log page.
For a SmartHub: login and go to Advanced Settings/ Technical Log/ Information.
Full router stats are key to any speed & connection issues.
2. Try a wired speedtest, using an Ethernet cable supplied with the router, here http://www.thinkbroadband.com/speedtest.html . Click on the "Results Page" button at the bottom of the graph you first see and then copy to here just the "Link to this result:" link that you see below the next main graph.