anyone find sound problem in cargobot or others ?

in cargo-bot, I found this but did not pay much attention.
in my app, still has this problem.

when my app is running, all sounds are ok.
after pressing home button, app is working in background.

we use other app then.

then we want to use my app again . then double press home button and choose my app.

SOMETIMES , sound in app cannot sound anymore. it is not rare, it is often.

in cargo bot , it is same.

any way to solve this ?