I ve been watching a replay 1v1 ranked game UID 3226695 Nequilich vs Flying_potato. At minute 42 i get a strong lag several times. Both people in the game chat experience the same lag as you can read in the chat. Before watching this replay to 42 Minutes you can check Replay parser for the chat to see this.
The Lag itself happens always when air units of potato come closer to the cybran t3 mobile aa unit. Since the game is not my game i dont have any logs but i suppose that there is something lagging with those units when they open fire.
I cent say 100% sure that it is those units but i had the same lag while watching a replay like the players who were playing it thats already suspicious.