Hi all. Just a heads up in case anyone having bother with this...I have Bixby routines set up on my s10+ for driving and before bed. Suddenly it stopped playing audible when I got in the car and stopped applying night mode automatically when I went to bed.. after investigation I discovered it was because I'd applied a third party theme! If u go back to an original theme it will operate perfectly! Hope this saves somebody the head scratching it cost me!
