airplay dropping and netgear6250

i have a 2014 macbook air and the most recent apply tv. both are up to date in terms of software.

i recently upgrade my router from a netgear wndr3400 to a netgear r6250 which has the most current firmware.

i use the apple tv primarily for streaming video from my macbook to my tv

after i changed the router, my airplay only works for about a minute before dropping the connection and making the apple tv go to the home screen.

i already tried turning on and off the QOS, using only 2.4Ghz instead of 5, and also making the wireless channels static. but it still drops.

would appreciate any help or suggestions on how to resolve this problem.

thank you