My iPhone 15 pro max is overheating after upgraded to 17.1 , could any one help?

Let’s define “overheating”. If an iPhone overheats it shuts down so it can’t be used, and displays a message saying it must cool down before it can be turned on, and it will probably be unusable for an hour or so. If you are seeing this it is a hardware problem and you should contact Apple support: 

• Click on “Support” at the top of this page
• Go to Contact Official Apple Support

Note that both of the above have options to receive a callback or chat

If you are not seeing this your phone has not overheated. However, if you fast charge your phone may pause charging at 80% and display a message saying that charging has paused, and will resume when the phone cools down. This is NOT overheating, and is normal when fast charging.

Also, some apps that use a lot of energy or that use cellular data rather than Wi-Fi can cause the phone to run warmer.

Try and force restart it to see if the issues persist t

1. Press and quickly release the volume up button.
2. Press and quickly release the volume down button.
3. Press and hold the side button.
4. When the Apple logo appears, release the side button.

my IPhone 15 ProMax has the latest update of 17.1.1 and after using it for an hour, it’s super hot and batter drained from 90% to 69% (which once it heated up - hot to hold- that’s when the battery started draining). I received the phone about 1.5 months ago and it’s been happening on and off regardless the software version.

I had an IPhone 11 Max prior to upgrading and never had any such issues. I also have alot of the background functions turned off to minimize the use of power. It doesn’t happen all the time but a lot of the time, and I cannot discern that one thing or another triggers it except for continued use.