Number of issues.
Have you set the phone to power save and if yes how long,
Is the auto shut down on in settings - chek teh time limit,
Is the battery failing - check full power charge to shut down time
Are there any apps running which is shutting down the phone, chck these as well.
In the marjority the issue describes power saving.
Sounds like your battery is either low or is old enough that it has developed a "memory". Try replacing it.
That's almost a question.
You have a virus. Or it is continuously overheating?
Sludge
Yes, it should stop all shutting down actions by your computer if the system is overheating.
Fuel pump or filter??
change MAP sensor
call this number for over the phone free help. although it will cost to call, only normal call rate though. 0488704055
format disk drive C: / ,theninstall a fresh OS
You have to install a chip that keeps it from shutting
When charging a system with a low pressure control and the control keeps shutting the compressor off, you should:
Replace rubber washers and possibly metal seats in the faucet
update your java.