I have two accounts which I use to play on Classic Era Whitemane, and I was using my priest on this account to help my druid on another account get the BWL attunement quest. At some point the priest started dcing in Blackrock Mountain repeatedly. Nothing was going on at the time, and it persisted when I disabled all addons. Meanwhile the druid on my other account was fine, which seems to rule out computer or internet issues on my side.
Any ideas on how this could be fixed? Blackrock Mountain is obviously a bad place to have as a DC trap in Classic WoW.