If a reset switch is effective during freezing, it does not have influence of a watch dog timer.
If a multiple push is necessary for reset, I think that the reset of the LCD does not succeed.
When freezing, can the following waveforms be seen with an oscilloscope?
Check 1
CH.1 VDD (trigger of power-on)
CH.2 LCD /RST pin
Check 2
CH.1 LCD E (trigger)
CH.2 LCD DB7 pin
Check 3
CH.1 LCD E (trigger)
CH.2 LCD DB4 pin
O-Family
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