Netflix has been deactivated how do you activated again?!?!
Welcome to the PlayStation Community.
What do you mean it's been deactivated, I'm not sure it can be?
Are you sure your subscription is current & paid up?, if so then try deleting then re-downoading the application to see if it helps.
Customer Service - 1-800-345-SONY (7669)
Account & billing Support -1-877-971-SONY (7669)
Available Mon to Fri 8am - 8pm PST