iPhone 15 Pro Over Heating

I bought a brand new iPhone 15 Pro from the Network Operator just 2 months + few days ago.

It was all good till a week ago, few days ago noticed that the phone was over heating just whilst not in use, whilst in use as well as on charging.

Then 4 days ago whilst on charge around 83% the message "Charging on Hold" - charging will resume when iPhone returns to normal temperature - appeared on screen.

So I unplugged charging, switched off, kept for about 20 mins and tried re charging and the same message appeared. Had to repeat. Got the phone charged.

My phone is ON most times except I switch off for few minutes and restart everyday and my mobile data is ON a good 80% of the usage.

When I touched the phone after about 20 mins of not using the phone was again heated.

So I switched off kept for 15 mins and restarted.

The software is updated.

My concern is on overheating.

Pls advice.

Thanking you in advance.