Ice Armor disappears in combat

I was wondering if anyone has encountered an issue with Ice Armor disappearing while in combat. I would activate Ice Armor by standing on a mine, or in blizzard, or by an ice wall. But then it disappears. Sometimes it will disappear if I cast another spell, but most of the times it disappears while I am just auto-attacking with the staff.  I can get the armor to reappear by leaving and then coming back to the activating source.

I have checked to see if it affects my defensive stats, and yes, it does.  When the Ice Armor disappears, I also lose my defense stats.  When I run away and then go back to reactivate Ice Armor, I get the defensive stats back.  So it is not just an FX graphics problem. It works normally out of combat while auto-attacking nothing and casting spells, it only happens in combat.

I play on the PC and do not have any mods other than hair mods. I have already tried playing without the hair mods and it still happens. I only just started playing again on a clean install, and I do not remember this happening when I played the game long ago.