Hi there
I’d be happy to help with this overheating issue you’re experiencing! It’s certainly not uncommon for a device to become quite warm to the touch during a lot of network activity or while charging. Quite similar to an internet modem/router in that regard. You can monitor the temperature of your device by dialing *#*#4636#*#* and tapping battery info.
While moderate warming is normal, devices must never get excessively hot. If the level of heat is excessive, it may indicate a problem with the device or battery. Examples of excessive heat include when it is too hot to hold comfortably or hot enough to melt or cause visible damage to the battery or device casing.
Hope this helps,
Charise