I occurred the problem once.When in Reboot, though, you're pretty much doomed since it'll glitch even if there's no one around. *sweat*
When queing up for Zakum never go straight into Zakum. When there is 10 people at the same channel as you, zakum is bound to to be bugged.
Just change channel to an unpopular one with less than 5 people and it will most likely never be bugged again.