That's a short mail. How is your power supply and software. Uneven power can make any device unreliable. Then a memory is filled with random or semirandom data. Check power supply pins with oscilloscope. But wipimg a memory is easy with your SW is easy, too.
in a simple unweird application, after reset, the compiler init the global variables to their init value, typically zeros. it is prior to main in startup function, as power up sram yield random content.
