I can't be 100 percent but you may have your line syncing at a lower speed than you may ordinarily would if you had left your router on.
Personally I leave my router/modem on 24/7, the reason for doing this is because I used to switch mine off at the end of the day, but when I was with a previous ISP I had my line syncing at a lower speed than I normally had when I switched off at the end of the day, after a few days or so it would return to normal, but there is always a chance that you may get a stuck profile.
My advice is to leave the router on 24/7 during the 10 day period and then decide for yourself if you want to switch it off every night after that period. But personally I would leave it on 24/7 as the router/modem only uses a very small amount of power. If you were going to be away from home for a period of time I would always advise switching it off then as well as most other things in your home.