After I installed Pro Sites 3.1.4 update, our Pro Sites subscription are not renewing each month, but stills charges the user. The user is then downgraded to a free site, and can't upgrade again, but still gets charged.
Also, when a users credit card expires, the user is downgraded to free site, and can't upgrade again.
See attached screenshot, I have translated it to english. Every time they try to upgrade, they just gets this message.