People are often concerned when their Samsung Galaxy Note 8 or Note 9 gets very hot. The first things we ask them before we provide the advice they are looking for is what were they doing on the phone when the problem occurred. Was it after a few hours of intensive use? Was it after keeping it out in the sun? Or it rather started out of the blue?
Understandable, the latter is the only situation that should ever concern anyone. The other two are rather natural things that can be easily fixed by letting the device cool down, without having it run any app or service and without keeping it exposed to the direct sunlight.
Otherwise, you can suspect a problematic third-party app that is messing around with all your system resources. You can test this simple and plausible theory by booting the Samsung Galaxy Note 8 and Note 9 into Safe Mode, where no third-party app is allowed to function. If it cools down in Safe Mode and gets hot back when you return to the normal mode, it’s definitely a third-party app. Hard to tell which one, but you’re free to start uninstalling them one by one or using a plain factory reset that will remove all your problems and, of course, all your data.
We get it, giving up on everything you have stored so far on your smartphone isn’t too attractive, which is why it is worth to try to wipe the cache partition first. Proceed to simultaneously tap and hold the Power, Volume Up, and Home buttons, until you see the Samsung Logo with that Recovery text written in blue, right at its top. Then, you can let go of the keys and navigate with the Volume Down to select the Wipe Cache Partition option. Start it with the Power key, confirm the action and wait until it’s done, so you can use the Reboot System Now and leave the Recovery Mode.
After you do all that, try to see if the Samsung Galaxy Note 8 or Note 9 still overheats. If it does, you don’t have any other option than the factory reset!