I downloaded the update from Play store and listened to a sermon and the player did not stop until the end. Thank you for figuring out what the problem was and getting it fixed!!
I have also been having this type of problem. It started after a recent Android OS upgrade (version 9.0). The sermon (archived) will play fine until my phone goes into "sleep/lock" mode. The sermon stops playing and I will have to unlock my phone, go back into AC Central and re-select the sermon I was listening to. So far, it usually restarts right at the place where it stopped previously.
This problem happens regardless if I am playing the sermon directly or if I am playing a sermon I previously downloaded. This problem did not happen prior to this last OS upgrade. I am using a Samsung Note 8.
Also, my son has a Samsung 9+ and he is having the same problem.
Customer support service by UserEcho