i've started having the same problem this weekend, thought it was my internet connection becuase i was playing through 3 different pcs and all 3 would disconnect randomly at the same time.

they all have different sets of addons, the 2 "slave" pcs have minimum addons, like jamba, and g15 and that's pretty much it.

i'm able to do instances and raid and everything for hour upon end, when i enter av i disconnect in the first run after the gates open.
never been a issue before, just started this weekend.