In SX Microcontrollers, SX/B Compiler and SX-Key Tool, James Newton wrote:

Try running it slower e.g. 1MHz and see if it gets better. If so, the problem is noise on the osc lines.

Are the IO pins floating? Not connected to anything? Try enableing the pull up resistor for each port all pins and see if that makes a difference. If so, the problem is stray EMF toggling the pins or latchup.

Also check the power supply.

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