ATM's

Last winter when I was in Zihua, I had issues with several cards, credit and bank card, not working in Zihua when I knew they were fine. The cards would be declined in several different ATM's or restaurants/stores after previously working there. I was told that in many cases, it was the location that had changed credit card/bank machine and they were not recognized by my bank(RBC) or my cards issuers. It was worst the last 2 weeks I was in Zihua and got me worried at times. I t was annoying as at times I was out in places I did not want to carry much cash and wanted to pay with a card and was worried if it would work or not. Funny thing on the last day in Zihua, at the airport, I used a card that I had issues with in 3 locations and no issues. Hoping by next February this is resolved for when I am back.