Volume button + charging issues

"Volume button + charging issues: Phone versión: iPhone 12 Pro The minus button for the volume randomly stopped working after 3 weeks of purchasing the phone. Also when I’m charging the phone, the battery percentage shows that it’s draining and not charging at times. What could be the problem and how do I fix it?"

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Return this. Seems you've been sold a defective item.

“The battery health is on 100%.”

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Get this iPhone Serviced...

Contact Apple, and setup a Genius Bar Appointment or see an AASP (Apple Authorized Service Provider) in your local area. Something is misconstrued here.

A. Contact Apple:

• Contact Us - Choose Locations
• Proceed from there as Necessary
• NOTE: Due to the Coronavirus Pandemic, calls are taking a bit linger to get through. And, that makes sense, because many are at home working out-of-the-house or are taking classes over-the-web, this they have more time on their hands to contact Apple Support. So, it might take a bit to get through to Apple Support. But, just stay on the line, and someone will be with you.

Or...

B. Contact an AASP: 

1. Go Here: Find Locations - Apple Authorized Reseller
2. Click: Service & Support
3. Enter: your location information
4. See: if there is an AASP nearby
5. Contact: an AASP that shows up, and find out more about the services that they offer to fix the Mac

Continued from my previous reply.

"Volume button + charging issues: [...]when I’m charging the phone, the battery percentage shows that it’s draining and not charging at times[...]."

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Troubleshooting iPhone Charge:

Visit the following links for tips on troubleshooting this...

I. Try what is on this Link: If your iPhone, iPad, or iPod touch won't Turn on or is Frozen - Apple Support

II. View the Battery Health:

Apple recommends you get a new battery, once the Battery Health reaches 80% or lower. When the Battery Health is 80% or lower, it is time for a new battery.

1. Go To: Settings
2. Tap: Battery
3. Tap: Battery Health
4. View: [the percentage]
5. Is it 80% or less?  If so, it is time for a new battery.

III. Perform a Restart:

Try Force Restarting your iPhone. Save any information that need be. Then perform the restart.

Go Here: Force Restart iPhone - Apple Support

IV. A Few Apple Support Sites that May Help:

• iPhone Battery and Performance - Apple Support

• Charge and Monitor the iPhone Battery - Apple Support

• About the Battery Usage on your iPhone - Apple Support

• If your iPhone or iPod touch won't Charge -Apple Support

• About Optimized Battery Charging on your iPhone - Apple Support

• If you see "Your iPhone Battery may Need to be Serviced" - Apple Support

"Volume button + charging issues: [...]The minus button for the volume randomly stopped working after 3 weeks of purchasing the phone.[...]"

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Troubleshooting Buttons:

Refer to this Link: If a Button or Switch isn't Working on your iPhone or iPad - Apple Support

Proceed to my following reply.