I know that this is an old topic, but I faced this precise problem today. My mavic air just stopped connecting to my phone with no visible reason. In fact, turning in USB debug may help(and it seems to help many other people), but for me, it didn't work.
What really was wrong is my phone memory. I found out that I have only about 20mb free memory and this was the reason my phone could not connect to the remote. As soon as I deleted some stuff everything got OK again.
Hope this helps someone
What really was wrong is my phone memory. I found out that I have only about 20mb free memory and this was the reason my phone could not connect to the remote. As soon as I deleted some stuff everything got OK again.
Hope this helps someone