Beam and sub not working

I have my Beam +Sub with a Samsung TV 

Beam works perfectly because it’s  connected via Arc To the TV. 
 

sub it’s connected with a solid white light status and the app says they are linked properly but there is not sound from sub. Sometimes the sound comes for few seconds and goes….

i already did everything recommended in this forum about deleting the sub and add it again…. Turn off and on…. Check for updates…. Reboot router…

im very disappointed with this  $700+ piece not working. 
 

do you have any extra suggestion?

Sonos tech support I already sent diagnostic 346752926