As far as I know, you only get a LeaverBuster wait timer if you have a habit of leaving games before they're finished. If you want to get rid of that wait timer, you have to play five matches through to their end.
I can't speak for crashes, but, lag would almost-certainly be Client-side (I.E., on your end).
I don’t this(sic) this is fair so i’d write this message.
But would it be equally as fair for your teammates to wait however long to reconnect, while their enemies rack up however big of an advantage over them? If you have lag issues, how long would it take to get back in?
If they voted to /remake, then that means they didn't trust your promise that you would reconnect. And that's fair - I've seen some people say "I'll reconnect, don't remake" - and we'd spend the entire game 4v5 because people were gullible enough to believe them.
Maybe, rather than expecting Riot to accommodate your laggy connection and pardon you for leaving matches, probably try and find a solution to your lag and/or the crashes so you don't have to be punished in the future?