Ive just bought a ring doorbell 2 and have a samsung S10 and having the same issues i cant hear the person at the door yet when i play the recording back it sounds fine this issues has been known about for months now and nothing has been done about it by Ring. the old solution to turn off the timeline event viewer no longer works as Ring have removed to option to switch it off. I have just spent over an hour to support trying to solve the issue yet they still wouldnt admit there is an issue with the ring app and samsung. I wish i had read about these issues before buying it as i would have gone for a different brand. i have given them 2 week to come up with a solution or im sending it all back (im doubtful of a solution as this has been going on for so long)