Subscriptions and reseller account get suspended every day.
There is Complete Switching to the new business model menu available in Tools and Settings.
Transition scheme to the new business model is not applied. There are some customers that were not switched to the new business model that belong to a reseller in question.
Backup psa database using instructions here:
881 How to backup/restore a Plesk database dump?
Apply the transition scheme:
go to Tools and Settings > Complete Switching to the new Panel business model
Subscriptions that belong to a reseller's customers will be assigned Custom state which means they have customized settings and they are not assigned to any service plan. It is required to sync reseller's account with the service plan or assign it to newly created service plan.
For more details about switching to the new business model, visit Plesk Administrator Guide.