Rekordbox 6.5.1 android sync failing?

I have Rekordbox 6.5.1 on my windows laptop, and Rekordbox 6 app for my android phone. I was able to sync one playlist about 2 weeks ago, but now my attempts are failing.

I select search mobile on the computer, and then Connect to rekordbox Mac/win on the phone. My computer will only recognize my phone as an option 30% of the time, and when I do connect a few moments pass before I get a message "Can't connect to mobile device". I am logged into the same wifi on both defices.

What can I do to help my connection work?