MAC address has changed - can I trust my network?

Other user John Orrik posting (https://support.avg.com/answers?id=906b0000000DhkcAAC).
John, To keep everything together, in future please try to keep the whole conversation in one question/thread to speed up any resolution.
AVG Guru

I didn't get an answer on my question on another thread.  Every time I connect to my home network, I am getting a message that the MAC address has changed that if I've connected to a fake network, anything I do online may be visible to others. There is a button for "I Trust this Network", but I don't know if I should trust this network.  My gateway from my ISP has not changed. The MAC address on the NIC inside the gateway is hardwires, so it would not change.  Do I have anything to fear from hackers or a fake network? Is my network being spoofed somehow?  Here is the screenshot of the message:
AVG message MAC has changed
Please tell me if I need to worry about this or if I should just hit the " I Trust this Network" button.  And if I do need to worry, what can I do to figure out what the threat is?  Thank you for your help.

Other user John Orrik posting (https://support.avg.com/answers?id=906b0000000DhkcAAC).
John, To keep everything together, in future please try to keep the whole conversation in one question/thread to speed up any resolution.
AVG Guru