I wanted to let you know with the Alpha version Much faster (hopefully), smaller (mostly) and better PMS builds preview (1.15.0.550-20055f39b) installed, I have no Plex server outages. Movies stream without fail on my Sony Android OS tv, my Iphone 8, an Android Samsung S8, and lastly my IPAD 2. The server is on a DS418 Arm 8. DSM 6.2.1-23824 version.
