Hi lgitlitz
I have now had this problem on two different projects running on two different SB70LC dev boards, one in the USA and one in the UK, both running on different power supplies. The processor and program keep running and everything else runs as normal except that all accesses to the Flash card fail until the power is disconnected and then reconnected. A software or hardware reset does not solve the problem. The software updates a website with new data every minute and reports the date/time of the last system restart. The flash cards are difference makes and sizes, I have not changed them at all. It has happened twice (once on each board) each time I was not in that country and had to wait till my next visit (three months and one month) before I could power them off/on, they both continued working correctly in all other aspects until then. I can identify the time it occured down to the nearest minute as both projects save data to the flash cards in a different file for each day complete with a date/time stamp.
I have now modified one of the projects to send an email if the file accesses start reporting any errors, both projects are running unattended.
Thanks, Bill