The sorc familiar skill changes back to fire whenever you enter a new zone, even if you’ve just used a cold or lightning ability. Easily reproducible by going to an area in the world or a dungeon and using a cold or lightning ability, then walking back over into a new zone.
A problem for ice, lightning or multi-element builds. It’s also particularly a problem in dungeons or any other area when the zone changes multiple times and just turns into another thing you have to keep track of.
Video proof: https://imgur.com/a/2MtiJmq