The ISP in question from what I see is BT. They did something really weird.
Probably without anyone knowing who is using BT, they dumped you into a sort of VPN. Everyone's IP is switching many times a minute.
So when this happens, the people who are mass downloading (see our other topic) and slowing down the site share the same IP with a normal user. Then the IP either gets banned or receives a message saying "Try back in an hour" or something like that.
Some people might have this problem :
https://www.imagefap.com/forum/viewtopi ... &sk=t&sd=aI will be checking more details as the weekend progresses. There isn't a magical fix button as we never saw an ISP do this.