Wi-Fi, Bluetooth, GPS turns himself off. If you enable them and reboot the device, then when you turn them off they Wi-Fi, Bluetooth, GPS switched on. This is a very big problem. HELP!!!Please!!!

Before these happened, did you do any setting on your phone?

I had an issue when the 'Location service and data' kept switching on by themselves. Running Android 7, Build: 20161216. I did a factory reset and this seemed to fix the issues. However I discovered when my battery ran low and I fully charged my phone I was having the exact same issues again.

I worked out that having battery saving mode 'Intelligent' turned on switches on your 'location and data services' as this is part of it's settings. All you need to do is select 'My Mode' and chose your own settings and still have battery saver on if you wish, or just turn battery saver off - which ever one you decide to do, problem solved.