Quite recently there have been some connection issues.
These have been caused by recent DDOS attacks on the network providers revolving Blizzard.
It means Blizzard is not being directly attacked, so it’s not at fault of their servers. (As far as i’m aware of)
It’s more a technical malfunction, and sadly enough SR cannot be refunded if you were wondering: Overwatch Technical Issues, SR Loss, and Leaver Penalties