Encyclopedia Brown and the Case of the Opus Card That Stopped Working Like Normal

A few days ago, my opus card stopped working while in my wallet. I started having to take my card out, and for the life of me, couldnt figure out why.

This has been going on a few days now, and was driving me crazy. At first I thought it was the opus card. Even though i only take it out once a month, it was somehow degrading. 

I realized today the problem was a new credit card. It must have some sort a chip in it that the turnstiles are picking up, so they get confused.

I just turned my cc 180º and it seems to have resolved the problem - the chip in the cc was overlapping the position of the opus card, and even though the cc was further away from the turnstile, it was still being picked up.

case closed.