Something else that might work (if you leave the router on 24/7) is to turn off your router over night. Usually on a Saturday and Sunday my speed drops to half. Last week I disconnected the router Saturday evening until Sunday morning and then was back up to normal speed. Will turn off router Friday night next week to see if that makes a difference. Weekends are off peak with my ISP.
This thread is now locked and can not be replied to.