iphone keeps turning on and off

4:38

4:49

3:13

8:03

7:02

3:39

4:57

7:16

5:42

7:46

5:33

6:54

11:37

5:26

7:53

3:58

4:21

2:01

3:27

8:13

9:05

6:21

10:39

5:44

3:07

7:36

4:13

13:33

6:58

4:53

6:02

3:04

7:48

1:56

6:14

5:51

2:44

2:15

2:45

4:02

3:09

1:19

5:16

4:14

2:58

4:40

1:49

6:15

5:50

4:22

7:52

7:46

3:07

5:52

8:21

10:13

2:55

4:08

5:03

1:23