There are a fair few threads regarding iPad wifi drop out.
The problem has to be backwards engineered if a solution is to be found. Which I don't know how to perfectly do. But I do have a theory.....
I do know the only constant in all these complaints is the iPad. Ipad hardwares are the same for every single model. Even the various versions of the iOS don't differ in this respect. So the different item here, the 'spanner in the works',
must be the wifi router of the user. this is the only item that changes from user to user and why there's issues.
I've always had perfect wifi reception likely, but in work it can sometimes be dodgy at best. Same for all other fellow employees with their devices. We know this is a wifi router issues.
Don't assume that your router is flawless just because it works on other devices. Or just because it's yours
Apple can't cater perfectly for making a perfect wifi connection with every router. Each and every router follow standards, but there is no set 'must', so components in each manufacturer's routers differ, meaning Apple can only please most of the people most of the time with their divice's wifi equipment. You've either got the right router or you haven't. My last 'cheaper' router was great for my iPod touch, but iffy with my smart phone. I now have a new connection and router and all works perfect. Put my old router back in the mix and it's dodgy again.
That's my theory anyway