Frost Armor has a set bonus where if you hit an enemy with any ranger or melee weapon, you will inflict the frostburn debuff unto that enemy. When this happens, the server thinks that you’re illegally inflicting a debuff and kicks you. It has been happening to me since I updated to 1.4.1, in Survival on PC.
It WAS Frostburn… this is most likely a compatibility issue, because Frost Armor’s inflicted debuff was changed with the advent of 1.4.1.
This isn’t the first time there’s been an issue like this; Sweetheart Necklace used to stone players (actually it might again now that it can give Honey to wearers), to name an example.