My iPhone 6 turns itself off and back on quickly 10 plus times a day

It's less than 6 months old and was perfectly fine until 2 days ago, while it was on charge, started switching itself off and back super fast, as in under 10 seconds. It's completely out of the blue and I've never seen anything like it and am struggling to find information about this online. Has anyone experienced this and know what is causing it? Is it app related? Please help!