I recently updated to one 3 and I'm having a couple of issues. Some of which are widely reported but I thought bet to repeat them in case any are linked to each other.
I'm having the common problem of increased battery drain.
Also I can't see how to change the colours of the edge lighting notifications (took me long enough to find where it was hidden in the first place).
But one of the biggest issues I have is with a podcast app I use. It has it's own lockscreen widget to control it but now if I get a notification for anything during playback, there will be a fight between the app widget and the music player widget, where both suddenly pop up and keep pausing each other, resulting in the podcast playing in half second chunks until I intervene.
Will this be deemed an app issue or a One UI 3 issue? everything was fine with the old interface.
I'm also finding that when receiving whatsapp messages, I will have a double notification on the lockscreen for a few seconds when it arrives.
Is anyone else having similar problems?