We offer two ways of playing/streaming our videos online (there's a switch in each user's profile). One is a custom library called Flowplayer and the other way is using the browser's native player. Flowplayer is a much better looking solution that adjusts itself easily to all resolutions or window sizes but some versions didn't get along well with iOS or Android 9.
As a result we have upgraded the Flowplayer library and it seems that it has solved not only the Android 9 issues but also iOS issues. Please make sure you have "modern Flowplayer" selected in your profile as that seems to be the best setting for now - for all devices.
Thank you for understanding and apologies for the past weeks when some of you may have come across this issue..