Same issue happening to me the past couple of days. Suddenly can't attack or switch weapons, but can block, sheathe and unsheathe weapon, and even interact with resource nodes. Ability to attack and use abilities just seems to randomly come back a few seconds to a couple of minutes later. /reloadui doesn't seem to be a reliable fix. This issue is occurring every 5-10 minutes at this point.
Its not any addons im using.Hey there @Lord_Wrath,
Do you happen to have any add ons installed? If so, please give a try to disabling them and let us know if the issue persists.