TheMashup Requests

Every time I use this site it crashes after 20 mins. Freeze and I can't log back in. Then I have to close my laptop down and restart the computer. Also I have noticed for a few months now that on some tracks I have exceeded my limit even thou I have only downloaded it once and I have also noticed that my total of downloads goes down a lot even if I haven't downloaded anything. Is someone else using my account. Often see tracks greyed out that I have not downloaded. Many Thanks.