So I got 2 new ATM cards from two different banks, both cards are Chip and NFC enabled. Card A arrived one week earlier than Card B.
Both of them remain in my wallet in close proximity to each other, separated by a thin layer of leather.
I have noticed that ever since Card B has arrived many times my chip based POS transactions on card A get declined saying Chip Error
I do know that NFC enabled card readers do get confused when 2 similar cards are there close to each other but this is about the POS credit/debit card processing machines.
I don't really think Card A's chip has gone bad on its own, its a brand new card with only 2 weeks on it.