How can liquid indicator be red in a brand new iphone 6 plus when it's never been wet?

Question

I have a brand new iphone 6 plus that turned off in the middle of a call I was on. It never turned on again. I took it to the store, they inspected the phone under the direction of an apple technician and could find NOTHING wrong with it. I shipped it to apple to be repaired, they just sent me an email saying the liquid indicator inside the phone is red. No kidding, this phone was only out of it's case for about 10 minutes and that was only because it took me that long to go buy the case. I know there has never been liquid of any kind anywhere near that phone. They said I have to buy another new phone. What will stop this from happening again?

Answer 1

There is not an Apple store closer than 2.5 hours away from me which is why they had me ship it to them. The AT&T guy that was helping me was on the phone with Apple and he asked the rep where the liquid indicator was on the 6+ and the Apple rep told him it was in the headphone jack. He initially looked in the SIM card slot but saw nothing, which is why he asked. When he looked in the headphone jack he said "it's completely white" to the Apple tech. It's funny you mentioned the humidity and having it in the bathroom while showering. I never would have thought such an expensive and highly regarded phone could be effected by something like that, especially when it in a full case. However, the tech I "chatted" with a little bit ago actually said this:
Cheryl:
"The phone doesn’t need to be submersed to have the liquid indicators turn red. My daughter caused her liquid indicator on her iPod by bringing it in the bathroom while showering."
Followed by:
Cheryl:
"If the humidity is very high it can cause damage yes. My rule of thumb I tell my kids is if your glasses fog up or there is condensation on the glass it could damage electronics that aren’t protected."
I copy and pasted that from the transcript that was emailed to me.