Hey Victor,
* Ensure the phone gets enough airflow when charging. If you didn’t hear, a girl actually put her Samsung under her pillow through the night, causing the battery to swell and burst while sleeping.
* Make sure there aren’t any power-hungry apps in the background that may be causing your phone to overheat.
* Only use power cables that came with the phone, or high-quality/certified chargers.
If it still seems like an issue, it could be a faulty device or battery. You aren’t alone though. Seems like after looking on Reddit, some other people are having the same issue. I would first switch to another charger, and then just send it to the manufacturer for a replacement.
Here’s the thread: [https://www.reddit.com/r/Axon7/comments/86g2zh/overheating_and_battery_issues/|https://www.reddit.com/r/Axon7/comments/86g2zh/overheating_and_battery_issues/]
Hope this helps!
-Alex