Many ISPs 'throttle' internet traffic, based upon the time of day and/or the type of traffic. (It's called 'traffic shaping'). A quick bit of Googling confirms that AOL certainly does so. That might be the cause of your problem.
You indicate that you're getting speeds of around 2Mbps, which suggests that you've already used a speed checker, such as the excellent Speedtest.net:
http://www.speedtest.net/
But have you also run a ping test? That effectively tests the quality of your line (rather than that of your ISP). You're looking for an 'A' grade here:
http://www.pingtest.net/
If you get a low grade from a ping test it's your phone line which is the most likely cause of your problem. If you get a good result from a ping test it might be time to change your broadband supplier. You tend to get what you pay for. The best available service (in my opinion) is Claranet, which repeatedly wins awards for its services to major businesses. However it's not cheap:
http://www.claranetsoho.co.uk/broadband
BT is frequently rated highly in reviews:
http://www.productsan...oryId=CON-TOTAL-BB-R1
Chris