Is it common for Iphone volume when headphones are plugged in to get softer over time?

This is my 3rd time experiencing the issue, my iphone volume got softer day by day when headphones are plugged in. Previously my 2 other phone have this issue and I have to buy a new phone. Is it a common problem?

Apple products are garbage. Its that simple

Check the volume limiting feature - it may be bringing the level down to protect your hearing.

If this is over a long period of time, try another set of headphones.

Also clean the headphone connection.

No. You probably have hearing damage. Please check with your doctor.