Disabling addons only prevents them from appearing visually on the screen, and does not prevent them from running in the background. A better way to test this is to rename the Add-ons folder and then try running the game.
As for starting only recently, assuming you’ve been keeping add-ons update, one of the updates may be causing problems. These aren’t pieces of software that Blizzard maintains, so making sure they work properly with the game is up to the individual developers of those add-ons.
If you do the above steps and still have issues, then you’d want to provide the files asked for at the top of the forum: