Phone overheats and loses its charge, when using the Maps app, even when plugged in!

Hi HMBJack,

Per the support article If your iPhone or iPad gets too hot or too cold:

"You might notice that your device feels warmer when you:...

• Use graphics-intensive or processor-intensive apps, games, or features, including augmented-reality apps"

and:

"Avoid these conditions and activities because they might change the performance of your device:

• Leaving your device in a car on a hot day.
• Leaving your device in direct sunlight for an extended period of time.
• Using certain features in hot conditions or direct sunlight for an extended period of time, such as GPS tracking or navigation in a car, playing a graphics-intensive game, or using augmented-reality apps."

The use of navigation will require simultaneous use of the GPS/Location features, data connection, display and possibly audio which can be processor-intensive. Additionally depending on the location of your device sunlight may play a factor in affecting device operating temperature.

Also from that page, "If the interior temperature of your device exceeds the normal operating range, you might notice these changes:

• Charging, including wireless charging, slows or stops."

Based on the information you presented what you are experiencing may be normal and expected under the circumstances.

Regards.