Custom Teams Glitch

Hello,

I am having an issue in the online melee games. Whenever I set the game in “Custom Teams” so my buddy and I can do 2v6 AI, it goes through seemingly random stretches where we can’t build anything and any units that do get produced in these glitch periods can’t move and have to be killed off. Is there something I don’t know or is this a glitch? Thank you for your help. I used to play Starcraft back in the late 90s and early 2000s and just recently started playing Starcraft 2. Not a huge game or tech person so there may be something just going over my head.