Suddenly Product key has been disabled

Hi,

I installed Norton Secuirty (for 5 devices) on 2 computers with expiry date April 04, 2016. Today suddenly popup appeared with message 'Your trial version has expired' on all PCs.

I tried to enter the key again and I got the message 'This product key has been disabled and cannot be used (-2008)'

I have attached the screen shot from Norton online account showing I still have 3 unused licences.

Online status shows my licenses has been cancelled.

Please help me to restore the licenses on my computers.

Thanks,