MXP activates screen after I have turned off the screen or something like that

This has now happened two times. My sister, is in school, and the phone is in her locker, then after about 10 minuts the screen lights up ( I think, because on the detailed battery info it shows that the screen is on for the whole 7 hours, and the phone get very hot according to my sister) , and then it is lit until the battery runs out, which is around 6 hours later. Battery info down below. I have used Gsam (without root) to see if it can detect if a app is rouge, but it can't find that. All apps is using it without any major using. Anyone that has o possible answer?

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