Anybody’s iPhone warm to touch when it is not being used and battery draining like crazy? When I started to use it gets really hot like I’m playing graphic intensive game but I’m merely using Safari. Started happening a few days ago I have iPhone X. I’ve restarted and reset all setting. I really don’t want to wipe out the phone and start fresh.
Use console if you have a Mac or access to one. From there look at the processes being used. Not sure if there is a windows variant of the program or app but there very well could be....
Don't keep restarting the device. Heat from the device is due to the resistance of electrical flow aka electrical energy is dissipating as heat energy due to the device doing "work".
Some processes need to complete fairly quickly for a good user experience, interrupting them can just cause them to not only restart but use other processes to remove the data that had already been downloaded/processed possibly with a verification process required first.
After an update the background processes that tend to work harmoniously are slammed. It needs to be completed for the iPhone to have its expect performance but doing everything while you are using it would provide poor performance. Therefore when the phone is locked (even not on power) certain processes run in the background like they normally would.
For example the 'installd' process is for installing, updating, removing apps and app data and everything in between. It can be a resource intensive task. This often goes hand in hand with 'deleted' which removes cache data ("Other" data) intelligently to avoid wear and write amplification on the NAND. Which also can be resource intensive. Meanwhile 'searchd' is compiling a database for all this data. Along with other stuff like 'cloudd' (CloudKit) 'homed' (HomeKit) and plenty of things I'm not familiar all have more work than normal.
That said the cause for the phone to actually get warm is generally from the combination install, delete and/or cloud daemon (and similar) while the network connection is low quality (weak signal). The network radio is using much more power meanwhile the low bandwidth causes the process to run much longer.
Even a night or two on the charger with wifi on might not be enough if something like iCloud is downloading 20gb of photos to store directly on the device if the wifi is poor.
That may have NOTHING to do with your issue but the only way to know is to look at the processes when the issue is happening. I mention this last because people kind of freak out but in Console you can see Errors and Faults, there will be A LOT however they are generally are taken care of and fixed by the OS (triggered by the error/fault) however it not a bad idea to see if there is something that is constantly an issue (shouldn't be if you are on a fresh install) it will look like pages and pages of the same thing..