Comments (1)
displayShutdopwn() does not do what you think it does. Try just clearing the display.
These kinds of problems are usually caused by wiring problems. Have you got the pull up/down resistor (can't remember which) on the comms control signals (just google this and there are lots of references). Other issues are voltage fluctuations for the display supply (eg, electromechanical devices being powered by the same power supply).
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