I am having the same issue on my 930 and also on my 920 and 1020. In fact I have not been able to see any 5 ghz network from the time I got my 920 or 1020 when they were launched!!
Saurabh, try disabling what's app in background tasks with the option enabled to start once the app is open, then soft reset the phone with the volume down + power combination and then start what's app.
Hopefully this will fix your issues!
What's app is very stable!!! U can even have individual live tiles for groups and contacts. All notifications comes through without a hitch!
And if you consider what's app to be crucial to you, it has a much better experience and functionality on windows phone!!!
You need to download the wintab drivers from the wacom website in order to get pressure sensitivity in PhotoShop and other apps!
Edit: I am on mobile, so can't ljnk to the download! You can find it in support and downloads section.
Just search for exif in the store. One such app is
Check out "Picture Info" for Windows Phone http://www.windowsphone.com/s?appid=04e3caac-2a94-4488-9e8a-86c856aa637f