It’s not a bug for any network issue to be happening. Bugs are issues with game play; an example is a turret firing through a wall.
This post would normally belong in Technical Support, but this isn’t anything the staff can address anyway. SR is never refunded, for any reason, your fault or theirs. I also know that this doesn’t feel good. But you can leave feedback about it in General Discussion if you know of a better way to make things fair.
More info on their stance here: Overwatch Technical Issues, SR Loss, and Leaver Penalties
If you need to speak to staff directly, you need to open a ticket.
But… your issue is probably overheating or a slow hard drive (also possibly because of heat issue). 81C is quite hot, and will force your components to throttle themselves to avoid max temps. I’m happy to work with you on this issue if you make a new thread in the appropriate forum (Technical Support) with your DxDiag 