The game would totally lock up when accessing any NPC such as a merchant or even the banker and I got loads of different error messages.
I tried so hard to locate the addon responsible to no effect and yes I did turn them all off and still had errors.
In the end it wasn't just the addons but all of their saved variables and other hidden assets that I had to remove, I literally purged my PC of everything addon related and started from fresh.
I added new installs of each addon one by one and it was a very slow and annoying process but now I just have addons I actually use and so far, so good.
In my case I believe I had some obsolete libs that were causing my issues but it wasn't easy to find which ones were interacting badly.
When people say to me........
"You're going to regret that in the morning"
I sleep until midday cos I'm a problem solver!