Asus RT-AC68U problem internet radio

Asus RT-AC68U with merlin RT_AC68U_3.0.0.4_374_35_4

Computer connect to wifi.
When listen internet radio randomly get the stream buffering ,
The only way to continue listing is reopening the bowser.
Have try with Safari and Chrome.

Wired connection have no issue.

Have visit a friend that have a RT-N16
No problem with the stream.

Is there a setting I missed ?

Video works without issues