My wife (this is her taru btw) had this during Garuda HM the other day. I froze in place on her screen and she couldn't heal me or anything. Thankfully I'm a DRG though and I was actually able to force fix myself somehow for her using Spineshatter Dive. It also happened to the WHM in my TUrn 2 group last night which was annoying because it was the tank whose position wasn't updating for the WHM. WHM was forced to reset after we wiped to ADS.