I have a Samsung Galaxy Ace II. The phone keeps getting red hot (when not in use)and the battery drains very almost instantly. There is no pattern. The issue appears quite randomly. Can I return the phone?
If the phone is still under the one year warranty you can send it in for repair. If you've had it for less than 15 days, you can return it and exchange it for a different phone. How long have you had your Ace 2x? Depending on how long you've had the Ace 2x, it may be time for a new battery.
If it is not a battery defect, make sure to check that you aren't leaving apps that will drain the battery open will the phone is not in use. A good app to use to help conserve battery power is Battery Doctor, look into it.