Blizzards stance is they will NEVER reset SR from a disconnect. Otherwise they would be flooded with requests of disconnects - either intentional or accidental.
The best thing you can do is look into what caused it and make sure it doesn’t happen again.
Hopefully @WyomingMyst comes along and sees this since he has all the links and stuff that you can use to check out what’s going on.
Not sure how to directly tag you in a post so I did that so you could explain it to this guy more in-depth since you do it already 12 times a day to other threads lol.