Frequent disconnects from online games and discord

When I connect to Discord for voice chat and play online games, I get disconnected from both the game and DIscord (though my friend says he can still hear me talking on Discord even though I can't hear him). I have to disconnect from DIscord and reconnect to able to hear my friend again. And getting disconnected in the middle of a game is super frustrating. 

I have a high speed plan (275MB) and have tested the speed to my laptop (which is on wifi), and am getting over 300MB down. I haven't experienced disconnects like this doing anything else on my laptop. 

I'm using the Xfi router that comcast sent me, and don't have any other connection issues.