D/C & Penalties for it.
It's really getting old that people get downed early & are so quick to D/C.
The killer loves it. The other survivors are likely screwed to a decent killer at the control. Down to 3 and still have 5 generators to repair.
If you want to be more balanced, how about when a survivor d/c the generator drops to 4 then 3 if two D/C. Going no lower than 3. Meaning if it's late game and still have 3 left and someone decides to D/C it doesn't drop to 2 in a way to prevent helping your buddy survive late by cleverly quitting at the right time.
I also think 2 D/C in an hour you get a 1 hr ban. More than 5 gets you a 12 hour ban.
If that's no suitable, then collect all the habitual quitters and have then play each other on a separate server.
Bad internet will not make you d/c as frequently as people try to lay it as an excuse. If so, I think you should take care of crappy internet you have. The connection was great until you were about to die. JMO.