Kalista, losing her auto attacks

I have been experiencing this a ton since her last update. I haven't been able to pin down what cycle of events occur before, but Kalista's auto attacks disappear. (I also neglect to take down what time, in my games, it happens to catch it in a replay)

The other day I threw my Q and the next auto attack just simply wasn't there. Kalista did her full animation, however her spear was invisible and did no damage. The next auto attack seems to fix this, but I'm wondering how many times this has occurred in team fights and otherwise.

I also only play with Blood Moon Kalista. Has anyone else run in to this issue? Because it happens at least once every game as far as I can tell.

Also, has anyone dealt with her just standing in place even though you are giving her attack commands? It seems to happen if you try to attack a minion, but the minion dies as the attack animation is halfway or so. Then, Kalista will just stand there until you make a normal move action or use your Q. I really feel like this isn't supposed to occur, but practically has since she was released.