Has anyone had a problem with their Lowrance units loading maps from an MMC/SD Card? I have the Lakemaster card which I have been using for over two years. The Lowrance unit started to drop the Lakemaster map data while in use and I was having to turn the unit off and restart to get it to load again. This only happened every once in a while, but started to happen more frequently. Now I can barely get it to load at all. I updated the system software in the Lowrance unit, which went fine, but the unit is still not reading the card. Every now and then it will load, but the map goes blank after a couple of minutes. I have the LCX-28c HD.

Trying to figure out if this is relatively common and if there is a quick fix. Any help is appreciated.