Hey ! Since the last maintenance, my companion started leveling up randomly and extremely frequently. Nearly every time he gains experience but also when breaking tree roots or completing quests.
Sadly for me, he does not truly level up. It’s only the “Level Up!” animation.
My companion is currently level 34 and has not changed level since the maintenance. I am level 60 and currently in the Gateway of the Great King. Though this issue happens everywhere, not only here.