Is there a good app to automatically warm iPhone?

Question

iPhone

iPhone 6, contagion, behaves like the battery is dead if it freezes even a little bit. Even frost is not needed, just cool weather is enough. You need an application that will monitor the temperature and lightly load the device with calculations when the temperature drops below a certain one. For example, mining bitcoins (mining for a cup of coffee in a year is already nice), participating in some kind of charitable distributed computing project like [email protected], or simply counting the number Pi up to some sign. Please advise if there is one. The smartphone is not jailbroken, it should be in the AppStore. Thanks in advance.

Answer 1

Is it better to replace the battery?

Answer 2

If the phone is under warranty - bring it to the service to the officials, this is clearly a problem with the battery.