Sound on iPad app?

Hi,
Is the sound on the iPad app working? The sound is ticked in my settings, and my volume is at maximum, but I get no sound for each move.... and there is no sound when the time is running dunning... no red light when the time is running down either...

*running down, I meant.... ;-)

I have the same problem on an iPad Air 2

Multiple people have created a topic about sound on a tablet, which isn't working. I have the same problem. Especially on bullet and blitz, sound is crucial - to hear that the opponent made a move.
Can someone of Lichess please pick up the problem and let a programmer repair it?
BTW: very occasionally there suddenly _is_ sound; but mostly there isn't. Without any change on the iPad qua setup/configuration.