If you did a reset that keeps your data, then it may not have resolved the problem. Try turning off the phone and then start it up in "Safe Mode". If it will start in that, then there is something on the device that is causing this. Bad app, virus, malware, etc.
You should also go into your google play store and turn off the option to 'auto update' apps. This can also cause the problem.
To get into "Safe Mode" please do the following.
1. First turn off the phone.
2. Next press and hold "Power" until you see the manufacturers logo on the screen, then release the power button.
3. "Quickly" press "Volume Down" and hold it for few seconds until you see the message "Safe mode: ON" or something similar.
4. If you wanted disable it...