There are so many things I love about this game, but the daily, weekly and monthly challenge xp disappearing is not one of them. It's so frustrating to complete a monthly challenge, move up to the next level and then logging in the next day find those 17000 xp missing (even though the challenge shows as complete) and your back to your previous level. I've learned not to count on the challenge xp at all in match making. I haven't noticed this issue in the other game types yet.
Lag is my other complaint. 1 out of 5 games has major lag.
Who else is frustrated with these?