Which specific error were you seeing?
I haven’t heard of this happening before, so it may be a new bug. I’ll keep an eye out for other mentions, but don’t see any in the forum so far.
If you received a penalty, then you left or disconnected from more than a few games. You can read more about the penalties here: Overwatch Technical Issues, SR Loss, and Leaver Penalties. Something to keep in mind is that Black Friday deals are still ongoing and Cyber Monday is coming up, which means a lot more shoppers are online in North America than usual — which can cause a huge impact on internet infrastructure. If you’re not playing on NA servers, then I would need more info to look into what might be causing more internet congestion in your area.