Error pause/run button in garmin 735xt

Dear Garmin sp
Im using garmin 735xt, in saturday (13/06/2020) , I use my watch when training ride
But yesterday, I check it but can use pause/resume button
I tried to reset, use usb conect, but my watch freeze.
Light, up, down and back button is ok, Only pause/resume I can't use it
Please help me to fix ít