Supernatural problems with iPhone?

My brother and I (both have iPhone 4S) were exploring the ruins of an old barn (probably 100 years old, only the heavy stone foundation is left) in a large patch of woods near our house. The ruins are not on any trail, and are surrounded by thick trees and isolated from civilization, in a way.

While we were exploring around 11:00 PM, my brother's phone, which had about 32% battery, shut off, as if it had lost power. About three minutes later, my phone (about 30%, too) also shut off. We soon left the ruins and exited the patch of woods. As we were leaving the conservation area, back on a paved road, both of our phones turned back on, with about 30% battery remaining. I was just wondering if anyone else has had this happen to their iPhone. It does not seem to be abnormal, but the coincidence of that happening to both of us simultaneously, and then regaining power, all while exploring a possibly "haunted" area seems quite strange. Any feedback would be appreciated!

Trust me, all iPhones do that at some point. It depends on how long you've used it though, if you've used the phones for more than 1 year than it's normal but if not then I can't explain it. Hope this helps.