Not a cure but try it.
When you call such in I find they have you do a few things. But I'll try to remember the more common ones.
1. Router is within 20 feet of the product.
2. Get wired for the test.
3. Tell what channel the WiFi is on.
Why item 3? Read http://forums.cnet.com/7723-13973_102-560420/wifi-disconnects-from-time-to-time-galaxy-tab-7-plus/?tag=contentBody;threadListing
There is more but WiFi is notorious for this issue. No need to repeat why.