My only explanation of this is that your router was trying to do a firmware upgrade. All of the routers recently got an upgrade to their firmware. Perhaps it kept getting interupted for whatever reason.
The firmware on these things is very stable. I've got over 3000hours uptime on my Sky router now. This is with over 10 devices connecting.
My Sky router has been stable for the last 6 months or so but recently I have kept losing the connection and have had to keep rebooting the router.
In sheer frustration I have had to ring Sky earlier on tonight and they said it is now sorted.
My connection is more stable now but I have lost around 512 Kbps on both the upstream and downstream channels but I'm not that bothered as I would rather have a stable connection besides when my area has FTTC I will upgrade to that.
I used to get around 3450/796 and now get 3072/256