Hmm. I see no reason why UPnP would have anything to do at all with local connections – UPnP is a router thing.
When you’re on your own network, the router doesn’t even need to be there.
Besides, if it works when you’re out and about, then UPnP is working fine.
I’m wondering if your phone is having trouble transitioning from 3G data path to the WiFi data path.
Next time this happens, try force-closing the Cloud app, then toggle Airplane mode on and off, then re-open the app and try again.
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