Following mage bug is happening daily for me. I talked to other mages and they had this bug before as well.
While casting it happens that your pink line doesn’t show up anymore. Meaning you cant cast anymore. You can fix it by using your ultimate. But it is really annoying how often this happens during dungoen or raids. I lose a lot of dps getting out of rhythm for casting and also for wasting the ultime if its up.
Most of the times this happens in dungeons or raids. For example:
2 hours of grinding it happend 4 times.
During a broken hall 11 ( arround 10 min)
It happend 12 times.
First hm Raid (1 hour) it happen 17 times
Second HM Raid (also 1 hour) it happend 38 times.