Read the statement by Michael Teeuw here.
MMM-WunderGround not updating after a few hours
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 I have installed the MMM-Wunderground module an have been running it for a couple week but cannot solve an issue with it continually ceasing to update until MM is restarted. It does this after about 8-12 hours. I have checked the PM2 logs and they do not show any related errors. When I use the NPM start dev command an watch the console I have found an error that says: "The ‘Access-Control-Allow-Origin’ header has a value ‘http://www.wunderground.com’ that is not equal to the supplied origin. Origin ‘http://localhost:8080’ is therfore not allowed access. This is followed by a message that says “MMM-WunderGround:* Could not load weather.” I have seen other people with this issue but no publicly posted solution. Does anyone have a suggestion? Thanks. 
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 It’s still updating after this error but I will monitor more and see if another error occurs before it stops updating entirely. 
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 Changed around some things in the way information is retrieved from weatherunderground. It’s on github, please test. 
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 @RedNax now i get the error, that the key does not exist. But it does. The next updating the weather, it works again. 
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 I will update and check the functionality. Thanks. @RedNax said in MMM-WunderGround not updating after a few hours: Changed around some things in the way information is retrieved from weatherunderground. It’s on github, please test. 

