The description of the the sphere notes 3 seconds and with additional 1 second passive should get 4 seconds of freeze. As is, before you can say Freeze/Unfreeze it is over. Less then a second. Once in a great while I can get the freeze crush to work if I run up behind the Boss and activate both freeze and crush at the same time. Most times wind up dead for my effort. :-)
Thank you for submitting this bug. We're working on a fix for it.