Welcome to the forums. I know how frustrating this can be. I had the same problem on my phone, but i did found a solution for it. The link is in my signature - but I'm afraid this will on work on Sprint device's.
Anyway, the problem you are having is one that plague many users who use WiFi to connect to the internet. Unfortunately, WiFi connection isn't as stable as 3g or 4G - here is a link to your device's area of interest Advent Vega - Android Forums. Where you can see if this problem has been mentioned before and someone has posted a solution for this.
Unplug the router for a minute or two. Restart the device. Get off and on the wifi connection.
Best of luck.
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