Constantly Alpha zombie

When playing infection, I constantly get picked to be the alpha. I rarely get to play as a survivor and it is really frustrating. No body who is at the top of the score board ever seems to be an alpha and it means they get a lot more XP than the rest of us. I hope that some sort of system is put in place where each player can only be an alpha once per game.
Also when others are selected as an alpha, they quit. This is annoying because the game then picks a random player to be an alpha instead. This doesn’t happen whilst the round is loading. If someone is an alpha and they quit mid game then it will pick someone who was previously a survivor to resplendent as an alpha zombie. To fix this issue, a sort of ban/ reduction of XP could be put in place to deter people from quitting. It doesn’t have to be long( maybe 30-60 minutes) and it can’t ever lead to a permanent ban but it’s there to deter people from quitting and ruining others experience.