This has now happened to me multiple times today, and I haven't even used my phone that much. Right now both my wi-fi and data bars in the notifications bar at the top are grayed out. Yet it says I'm connected to my network and I'm sitting literally 3 feet from my router. When I try to launch any apps that use data, I get nothing. I've been watching my phone for about 5 minutes now, and nothing has changed. I just went and looked at my wife's Maxx, and it shows 4 bars 4G.
I finally went to airplane mode and back, and then I was showing both wi-fi and 4G.
To those of you having these issues, are you using the Smart Actions by chance?
This has gotten much worse for me over just the last couple days...
EDIT - checked 15 minutes after I posted this, and I had no data once again.