OnePlus 3 that restart randomly without any obvious reason is an issue that needs to deal with for the sake of your convenience and here is how you can solve this issue right away.
Despite the fact that OnePlus 3 is a new phone that was released not too long ago, there have been several issues that were reported by its user and perhaps you are one of them. One of the issues that were reported is about the random restarting process that happens from time to time. It happens without any obvious reason at all and it surely will disturb user.
In most cases, it happens while the user is using the phone to browse the internet. If you are also dealing with the same issue, then you can try a couple of things first before you contact OnePlus support for repair or perhaps replacement.
First thing to try is to get the latest OxygenOS from OnePlus. The latest OS will improve the OS performance by fixing bugs and other issue. The improvement in the latest OS didn’t specifically aim for this issue, but it something worth to try if not for fixing this issue, then it will serve well for the phone performance.
Other things that are worth to try is to get the phone completely drained where it won’t turn on. After that, charge the battery and turn it back on only when the battery is fully charged. This solution may work to solve this issue and there is no harm in trying it.
Factory reset is one last attempt that may solve this issue. Factory reset will bring the phone setting back to its original factory setting. Factory reset is a solution for many issues that happen to a smartphone and it is definitely worth to try.
Go to Settings > Backup & Reset > Factory Data Reset > Reset Phone > Erase Everything. You need to backup everything before you do this so you can keep your data save. Once the process is complete, you can use the device like you used to and hopefully it won’t caused you any more trouble.