I have 2 active subscriptions to TrendMicro Maximum Security 2019, and two computers running Windows 7 Pro suddenly lost protection and displayed a message that I need to enter a valid serial number. One is a Dell mini tower 64 bit and the other is a Lenovo 32 bit. The Dell computer : I retrieved the serial number and when I returned to that computer, the error maessage was gone and the protection was active. On the Lenovo again, while I was away from my desk, the protection shut down and displayed the invalid serial number message. I had to reboot this computer to restart my protection. Both computers are on the same account. This is VERY DISTURBING, because if my protection shuts down and I am not physically present to restart it, I am vulnerable to attack. This is a new problem. It has never happened before. Please help me to fix it, or I will have to close my accounts and purchase protection from someone else.