Controlled character freeze during combat

Do you have any of the "Trials" enabled in Options-Gameplay-Trials (accessable only from within the game once you've started)?  There are several options in there that can make your game more challenging, all of which contain a warning about "unpredictable behavior by characters during battle" (that's not an exact quote, but that's the gist of it).

This unpredictable behavior result's in characters, and sometime enemies, freezing during combat.  Enemies can be unfrozen by hitting them a few times, characters can be unfrozen by taking control of that character and either jumping (as you noted) or initiating an attack (with the PC by clicking the left mouse button).  After that the character is back to normal.

I personally have the trials: Even Ground (makes enemies level scale to be at least yours), Walk Softly (enemies can have unique abilities nor normally seen), and Grizzly End (makes bears tougher).  This results in more challenging encounters, as well as occasional loot in you chest in Skyhold (down by the crafting stations).  Because I'm aware of the freezing issue, I keep close watch on my characters during battle.  For me I accept the freezing issue because I like the increased challenge, and the fact that I will never run into a low level mob.  I always get experience points from a battle.  And I've never had the freezing issue happen more than once during any encounter.

So if you do have any of the "Trials" enabled, try disabling them and go back in game and see if that corrects the issue.  Years ago when I first played DAI I didn't have any Trials enabled and never had a freezing during combat issue.  You have to  weigh the pluses/minuses of the situation to find which game play experience you prefer.

While I am on a PC, I believe the Trials issue is universal across all platforms.