Hi All!
Again my sincere thanks to everyone! For Robert, the whole "system" is digital and there is no analog. The sensor only puts out digital information. Yes, it appears that the "Gosub" where Jerson located it was the error! Changed it to a "goto" and now everything runs longer than 3 minutes! FYI, the PIC never stopped running as Mclk would continue to change just the "FromSensor" would stop changing. So Henrik you were right (as usual!) I had just been lucky. By the way, I put everything on a small board, added a bunch of capacitor (probably overkill) so at the input and output of the TXB0101 there are a 470mf, 100mf tantalum, 01 ceramic, and on the bottom of the board, a 1mf tantalum on the input and output of the MCP1700-3002E voltage regulator! Best to all, Ed