I also have a metal mailbox. I have the same issue… it never clears! However… the next time my mailbox is opened, I get a notification, and that is all I care about!!! I even had my motion detector go “offline” in my app, however, again, as soon as the mailbox was opened, I received a notification! I think Wyze needs to do a little more work! The bottom line is the motion detector is doing what I want, notify me when the Post Man opens my mailbox. I am very happy. Not sure why the sensor reflects “offline” in my app, however as long as it does what I need it to do, I am happy.