My clock timer in queue is freezing.

I thought this was happening for a while now, because I would queue up and check back on my queue and it seemed like a lot more time has passed than what the queue clock timer thing was saying. So I queued up for a ranked game and started my own stop watch. Checked back on the queue and it said 1:30 when my stop watch said 4:45........ The only thing I'm doing is queueing up and alt tabbing. I got a pretty shit mac with long loading screens. Just thought I'd throw this out there if anyone else is having the same problem (probably not noticing it like i was for a very long time).