Extremely disappointed by constant leavers on the PBE.

Lately, my games have been filled with constant AFKs. These past two weeks, I have had leavers in almost 80% of my games. If they are not on the enemy team, then they are on my team. What's even more of a kick to the face is that I got a LeaverBuster warning for no reason in my last match, when it was actually 2 of my teammates (Kalista and Sona) who left the match. It is almost unbearable to play a match 3v5 when you are pushed into your base with nothing else you can do. Why is it that I see so many leavers on the PBE than on live servers? What is it about the PBE that would justify why some people would leave?
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