Agreed. A swap of memory cards should be an easy and, depending on whether you have another, cheap troubleshooting step. And it should be a different brand or type. I had a Treo smartphone a number of years ago (remember those?) with a navigation app (using cell towers) that worked only intermittently and frequently crashed. Turns out it was some sort of incompatibility with the SD card I had the maps stored on. Switched memory cards and all troubles went away. Turned out the brand/type of card was incompatible with the way the program worked (although the card seemed to work fine otherwise). I know it's a different situation, but it demonstrates that the memory card can cause problems in a device that is otherwise working fine.