Kalista Sentinel Bug

So, recently I've picked up Kalista and I'm really liking her, however I've noticed that there is a bug that occurs suprisingly often when I use her Ws active, Sentinel.

It appears that casting a Sentinel at a point fairly near terrain, the Sentinel appears to freeze for about 5-10 seconds at the casting location, and does not function for this duration. The Sentinel simply freezes and doesn't do anything.

An interesting thing I found however, is that, while there is no effective vision reveal from the ghost as it is frozen, if an enemy is seen along its theoretical path that it doesn't physically appear to be following, it will suddenly teleport to that location and chase the enemy as normal.

Not sure why this is happening or if anyone is having this problem, but it is a little game breaking as just using it to scout out baron becomes rendered useless unless it "contacts" an enemy.

Since this is actually happening more than I'd like, I'll see if I can get any screenshots sometime soon.