The thing is that most people are reporting bandwidth degradation, but they are bandwidth degradations that don't actually matter for everyday activities in some cases. So I would suggest turning off cellular data. Connecting to wifi using the normal procedure. Does the connection stay? Walk around your house? Does it still stay? Can you surf the web? Stream video? Then you're done.
With these high speed connections, shaving a few mbps is no big deal because 6-10mbps is suitable for everyday activities. There are DSL lines that are 3-4mpbs. I share my internet connection with an entire building, and most of the time have no trouble.
Note: I am not saying that some people do not have a problem. I am just saying that the anecdotal tests are sometimes more important. I do run speed tests for end users that are concerned. There was a post earlier that said that the speed test app might have made things worse, which is unlikely, but who knows.
If the connection is dropping, it's a problem with DHCP release and renew. (esp. if you have to reboot the ipad to get the connection back.)
Routers that are dual-band may need to be seperated into two separate networks or limited to only one band.