No issues here, and if you have to install a specific app and do other very specific things to produce an issue, it's generally not much of an issue. My volume is maxed out (both speaker and headphone) often and I have never experienced this. For a single speaker it's actually very good compared to other phones I've heard including the iPhone 7 and GS7.
"Beta Device" lol. Literally every phone ever made has issues (and usually far more serious than this one) if you go looking for them. Look at Apple right now, dealing with battery recalls, serious screen issues, home buttons giving people 3rd degree burns, and Chinese authorities regarding exploding/fire causing batteries - silly beta testers