T4 defense lockup?

[xdevilsadvocate]

So I'm not sure whether or not anyone else has been experiencing this annoying interruption, but every so often in defense missions, especially T4, when Vor or syndicate appear to haunt the squad, it chokes up and there isn't the continue/extract screen after wave 5/10 or whatever we're on.  We just kinda sit in nothingness.  Anyone else have this problem or know how to fix it? 

[Cortanis]

I get this on the regular. More often than not, it actually tends to cancel out the spawn rather than the timer actions. Timer starts to go off for extraction countdown, blabbermouth Vor starts his stupid dialogue, we hit the continue or extract screen, and regardless of which one we pick Vore or syndicate disappear with out spawning. The pick timer still locks up for a while and everything, but after about a good 30-40 seconds it'll start doing the countdown again. Very rarely does it outright lock up to the point that I have to close out the program.