By interference I think he is referring to the wireless/Bluetooth activity in the room where tested. If there are lot of Bluetooth connections and wireless connections (e.g if you open the available wifi connections, are there lots which are not yours) this congests the airwaves so to speak and cause problems in speed, signal strength, connection dropouts etc.1. Yes, wda and my tablets have up to date software.
2. What do you mean by bluetooth interference. Can you refine further? Is it things that are connected to my tablets ?
3. My wifi is 2.4ghz
Hope that helps.
Thanks for helping too