For about two weeks, I have been having a problem with the music randomly turning up to maximum volume. I thought it was a problem with the old iPhone (XS), after several reinstallations of apps and updating the phone to iOS 18 the problem persisted. I replaced the phone and on the iPhone 15 the problem still occurs, but surprisingly at a lower frequency. Normalizing the sound in the app options did not help. Please help or I will have a heart attack. 
I had this issue for months, if not longer. Occasionally the volume would reduce, but more often the volume would crank to the max after certain actions, such as searching for another song or checking another app and then returning to what was playing in Deezer. Could never pin down exactly why, nor could others. Then the issue seems to have gone away a few weeks ago. Sorry to have passed it on to you! ;)
I had this issue for months, if not longer. Occasionally the volume would reduce, but more often the volume would crank to the max after certain actions, such as searching for another song or checking another app and then returning to what was playing in Deezer. Could never pin down exactly why, nor could others. Then the issue seems to have gone away a few weeks ago. Sorry to have passed it on to you! ;)
Thank you for your reply! It's good to know that it's not just my problem, I hope this curse will pass on somewhere soon ;)
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.