We just updated to the latest version of XenForo and v2.2 included a lot of updates so a few things might look off at the moment. We're working through them and please let us know if you spot something. Thanks!
Could be a bit of both mate.
If it was purely random times and consistantly through the match it may be his or your connection playing up a little, or the server dicking about which happens from time to time.
Whereas if it was at very convenient moments for him, like when you were attacking or defending making it hard for you to judge shots or tackles, chances are he was lagging the game up to get an advantage.