Quote:
...and neither of them can get past the purchasing of premium as it just says Connection Failed and sends me back to the login screen.
I had the same/similar problem. I couldn't use my tokens in any way (premium, chests, keys), it would just disconnect me whenever I tried to.
Sent a ticket to SM Bug Report Center, and it was fixed by tomorrow.
Now, I don't know if they had problem with purchasing on their part, or was it just my account. Anyway, it's fixed now (for me).
If your problem is still persisting, a ticket might just help.