I played against a master and a hack recently, being an amateur myself.
I played unusually well and had a lead before the 9th and last hole, +3 against +4 for the master. Then he disconnected during the 9th hole.
Would he lose a lot in ranking if he lost to an amateur and maybe quit because of that? Did I lose in ranking compared to if he had finished the game and I had won?
All disconnections, for whatever reason (technical problems, toilet visits, being caught by the boss or keeping a good record) are annoying but I guess there isn't much you can do about it.