You're not using Windstream are you? I had the exact same problem a months ago. It took numerous calls and numerous visits from techs to finally get the problem sorted out. I was getting the same under 1Mb during the afternoon and evening, but very late at night and early in the morning getting the full 3Mb. The problem was too many customers on the DSLAM, and upgrades were required. Late afternoon and into the evening is when home users use the internet the most, hence the reason why the speeds slowed down during those times when the DSLAM was overloaded. After the upgrades were made at the DSLAM the problem was resolved. You need to bug your internet provider until you get results. Have friends, family, and neighbors that you know have the same provider in your area do speed tests during the slow speed hours and if they too are seeing the problem have them to call and report the issue as well. It takes multiple customers complaining to get anything done about the problem.
