How about immediately forcing dc player to return to base upon dc?
EDIT: For clarification, I don't mean xayah/rakan-level instant recall into base, just having your champion make the walk back to base.
Maybe grant bonus flat armor/MR until they reconnect, rather than just sit there for 20 seconds before finally registering the fact a signal is lost. It makes little sense how you can dc for .5 seconds, and sit there in a loop of "attempting to reconnect" for 4 minutes when it's usually faster to just kill the client and reconnect manually.
Quite frankly, the new client performs like crap, and has all of the same bugs and issues as the old one, but with better visuals. Quite a lot of hyped up talk for something that's been out for what, almost 2 years? Any other game resolves connection issues in a fraction of the time; so what's up?