[Q] Moto E not downloading even though 3G/Wifi is ON topic

Dear All,
I could download apps from apps store in my moto E till few weeks ago.. but now, though 3G is ON still I am not able to download any apps.. the download process keeps going on & on without completing. Also I am not seeing any downloading icon at top of my screen..When I go back to check in apps store, it still shows installing..without actually doing anything.

What could be the problem?

-Regards,
Satish