incoming call ringtone low even when volume to full

I'm running iOS 17 on iPhone 14 pro max and post update I'm facing issue with incoming call ringing. The sound is too low on my iphone and I get to know about an incoming call from my apple watch series 8 which is cellular.

However, if I restart the iPhone, the issue gets resolved for sometime and the phone starts ringing louder. But this stays only for a while and it goes back to low ringtone volume.

I've tried most of the settings but unable to fix this. Please help.