The bug
As new ambience sounds were added to caves, those sounds plays too often when the players is inside a cave with a aprox of 5 seconds between sounds.
Note: in Java Edition this sounds plays randomly and they take more time before play again another sound.
Steps to reproduce
Go find a cave
stay in cave for a while
you´ll be able to reproduce succesfully this issue
Linked issues
duplicates
Comments

Thank you for your report!
We're actually already tracking this issue at MCPE-69154, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki