There is another issue that suspended a subscription with 15-16 domains for me.
I have a number of accounts (domains) owned by the administrator, I am only hosting a small number of customers that we do development for. They are all in one subscription.
Every night at 6:41 the subscription was suspended ( last 3-4 days until I found a possible solution today ).
The domains was all in a plan called "unlimited", that plan is not present in business manager.
Every night a business manager related psa script must check for plans and it seem to suspend plans not present in business manager as well as any other operations it was designed to.
Solution was to add the Unlimited plan to business manager, set it up, it does not need much and I just set pricing to a dollar to get the plan valid.
I will have to wait until tomorrow to see whether it will work...
If you have many domains under one subscription you should try to activate the subscription, not each domain, that was how I got the sites active last 2 days, the first day the problem occured I changed back to an earlier vhost configuration file and restarted apache.