stuck at address 0x00000344 - MBC2103

Hi,
Occasionally my code gets stuck at address 0x00000344 - I'm having trouble figuring out what's going on in the debugger. The disassembly list in uVision seems suspect as I page up and down (output looks like it's a loop of some other different memory locations?), and the call stack is empty... Perhaps this is a 'protected' interrupt or another unused interrupt that the default Startup.s sets up to loop-in-place, but I'm having trouble figuring out where/what that is, I need some guidance, kind of a newb with Keil tools and the LPC210x... yikes!

0x00000344 FFFE (???)
0x00000346 EAFF ???

thanks!
Marc

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