Energy Shield randomly turning off when it shouldn't

Hey so 3 times today in a session I had my ES turn off when it definitely shouldn't have. One time was only 3 minutes or so after casting it (I use Memory to prebuff with a near 20 minute duration). My mana pool was not reduced to zero (or even close). I do have the incidents on video and reviewed them, didn't notice any reason for it to just turn off. The ES just simply turns off as if the timer ran out. In another case it was more like 5 minutes after casting, but in both cases it should have remained.

I can clip the moments if needed but I wanted to see if anyone else has noticed this issue lately, if this is some new bug. I've never had this happen.

EDIT: Here's the first time it happened in the session, which is even more egregious than the 2 times I mentioned above. You can see in the clip I refresh my ES in town and then it shuts off when I cast

Battle Orders only seconds later! The other two times it happened I was not casting BO, for the record!

So I went as close to frame by frame as I could and the only thing I can think of is skill cast interruption. In town you cast ES and then

Frozen Armor. But

Frozen Armor is cast to rapidly after ES that it looks like you interrupted the ES cast, causing it to not actually cast.
When you take the WP, ES disappears while you are casting BO/BC, as if the timer just ended - because it probably did.
To me it looks like you are just casting your other pre-buff skills too quickly and not letting the ES cast finish, therefor not actually recasting it like you think you are.
Bug again, its pretty hard to tell.