Screeneo U4 keeps switching to internal speaker

I just got my Screeneo U4 and have connected it to my Sonos bar which works great, but after I have switched off and turned on my Screeneo U4 the setting has gone back to internal speaker. Anyone know how to have the Screeneo keep my setting of ARC to which my Sonos is connected?

Hello, we have corrected it by software update. Please proceed to the new update.