Why does AirPlay Mirroring drop out?

My iPhone 7 Plus keeps dropping out when trying to use AirPlay Mirroring. I have the NBN, have updated to the latest versions of iOS and tvOS, turned off background app refresh, and tried resetting the Apple TV and iPhone. How can I stop these annoying dropouts?

[ CHRISTOPHER HOUGHTON ]

Howard Oakley replies: First determine whether this only affects incoming content from the internet, or all content streamed to your Apple TV. If it doesn’t affect locally-stored content, then it’s probably an issue with your internet connection, which may prove hard to fix. Being on the NBN, you should have ample bandwidth, but there may be technical reasons for periodic dropouts that only your ISP can remedy. If this is a local problem, work through Apple’s setup for your wireless router, detailed at support.apple.com/en-au/ht202068. Because some routers can encounter issues between local wired and wireless connections, it can sometimes help to use a wireless connection between your Apple TV and your router; other routers may work better on a wired Ethernet connection. Wireless interference is another possible cause. Ofcom’s Wi-Fi Checker app (free, tinyurl.com/tla77-ofcom) can also be helpful. Sometimes separating out your Wi-Fi connections can be beneficial. Name your 2.4 and 5GHz networks differently; put your Apple TV and iPhone on the latter, and other devices on the former. Even then, you may need to wait for a software update for a complete fix.