Using Airport Express for Airplay connection to existing wifi network
Just installed a new Linksys AC1750 router, works great except for Airport Express that I use to link audio to an older music system. Airports needed reset after new router install (new names and pws) and all seemed great. For a couple hours, then both went dead. Opened Airport Utility and saw they both had greyed out - were no longer part of network. So I hard-reset them via Ethernet cable, gave 'em new names, plugged back into stereo -- yay! Music through iTunes with multiple outputs, everything works. For a couple hours, then dead again. Have tried switching the IPv6 setting, reserving the IP addresses, changing names and factory resets. Help!