Possibly not for you, but I noticed a long roll-out of switching from stripe to chip. Then, a lot of card readers in major retail stores not "allowing" chip transactions and having to switch. Still even now, most fast-food places disallow chip transactions.

Most recently, I have a repeatable bug in Walgreens where my newly issued credit card (old expired) will not run chip transactions. Their system requires me to attempt a chip transaction first (of which I must do three times) before it will allow me to finally swipe (and work). If I attempt to swipe at first it will require a chip transaction (and on, and on, and on...)

However I can't completely blame Walgreens on it; they're the only one that's reproducable 100% of the time (3-5x now since card was issued). I've also had to re-do transactions with that card at Target but that's hit-and-miss.