Frequent disconnects on AIM

I have a problem with disconnecting a lot on AIM. Every now and then (about every hour/half hour-ish?) AIM will randomly disconnect and reconnect. I thought it was my ISP (Comcast), but almost all of my friends use Comcast and no one else has the same problem. The weird thing is that, when I switched to GAIM temporarily, it worked fine. But I don't want to use GAIM for various reasons (mainly because I can't directly connect to anyone on it which is something I do frequently).

tl;dr How do I not disconnected on AIM?

>>5
1. I use Firefox.
2. I have Nod32 constantly running in the background.
3. I did, and decided I'd rather have the disconnects.