Power Control (PCON) Register

[Dick Ivers]

The following code modification fixes the problem. The idea is a double set of the MCLR reset flag. Electrical noise tends to disrupt the initial condition of the MCLR bit so a double set is needed:

        if PCON.1 = 0 then      'when por reset has occurred
        PCON.3 = 1              'set mclr flag
        PCON.1 = 1              'set por flag
        endif

        if PCON.3 = 0 then      'when mclr reset has occurred
        PCON.3 = 1              'set mclr flag
        goto current            'jump over data display
        endif

This is working nearly 100% of the time, unless the noise environment is very,very severe.
The fix is posted here for future reference.