Autoattacks acting very strangely since 7.6 update...

This is a tough one to describe. I've played two games tonight, and on both my autoattacks have been very strange and buggy. Previously I could right click on one minion from a pack and after killing it, I would just automatically start attacking the next closest minion, etc. until they were all dead.

Now my character will randomly (and frequently -- like once every few seconds) just stop autoattacking and stand in place doing nothing. Sometimes It's after killing a minion, sometimes it's in the middle of killing a minion. Sometimes when a minion dies my character will walk up to the next one like he's going to attack it but rather than attacking he'll just stand there and do nothing.

Both of the games I've played are on Xin Zhao -- I haven't checked other champions yet, but it's extremely noticeable and really difficult to play around. I feel like I have to right click once for every single autoattack just to make sure attacks aren't getting randomly dropped.

Edit: This thread describes the issue more specifically than I was able to.