I started a separate thread for this before realizing this sticky is here, so I am posting here as well.
When I turn on (wake up, whatever...) the unit after it sits closed and idle for a while, maybe a few hours or more, Metro apps cannot connect to the internet. I've noticed this especially with IE, the Store, and the weather app. They don't always just hang, they sometimes show a big message that there is no connection (Fix Connection Issues, or something like that). However, if I go into desktop apps, I can connect just fine. Last night, I toggled my wifi off and on, and all was well again. But this doesn't always work. In fact, a restart didn't help this morning when it happened.