[vizzah]

I had the same experience with NFC hotel card failing after being in my pocket (next to other cards and a phone). It had to be re-programmed at the hotel's desk to work again. Puzzled me enough to search net for the answers, but to no avail.

[tonyarkles]

It's the phone. Have had this happen multiple times with just the card and my phone. Not sure if it's doing some kind of NFC ping on the phone or if there's just enough of a magnetic field around it or what, but I reliably locked myself out of my room the first week doing field work this year by putting my phone and my hotel card in the same pocket.