The lock in the Network Preferences opens automatically

My 6 months old intel-based iMac is connected to the internet via an Ethernet cable and a router. For about 4 months there was no problem. Then suddenly I kept being disconnected from the internet for no obvious reason. When I looked into the network preferences I noticed that the lock, which prevents changes of the settings and which can be opened only with the password, had opened AUTOMATICALLY without anybody entering the password. After I close the lock and reset the router I can go online again, after a day or so the same happens again. What could be the reason for this?

Hi
Try this, go to Security and Privacy in System Preferences and unlock if locked, then tick the second box down in "For all accounts on this computer" called "require an administrator password to access system preferendes with lock icons"
Fingers crossed.
George

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