Slow internet speeds in Gainesville,Florida

Hi,

   I am having issues with internet speeds usually at night after 8. Speeds have been slow during this period for a month now. Cox tech had a look at Signal levels and everything looks fine according to him. Speeds start dropping after 8 and sometimes go as low as 100kbps. Its been frustrating dealing with these speeds and calling support nearly 4-5 times a week and reaching no resolution. I have no idea what to do now that Cox tech said that there is no issue in signal and line at my place.

Thanks.