Is the weather cold there? If you're in truly wintery conditions, such as consistently sub-freezing temperatures and outdoor parking, expect a 25-40% range reduction.
Yeah, SiriusXM hasn't been working for me either. That's why I didn't bother to fix it and got rid of it, but I was wondering if you might have heard anything about security settings affecting it?
I had a similar noise problem with my 3 yr old e-tron. Replacing and cleaning the brake pads appeared to resolve the issue, but it's worth noting that e-trons rely heavily on regen braking, so noise may not be a reliable indicator of wear.