I have been driving an LCD display with an 18M via R330 resistors. No problem at 1st then the download started falling over after which the computer couldn't see the chip at all. Change chips, same story. The 08Ms, 14Ms have no problem with downloads only the 18Ms so it must be the chips. There is nothing on the board over 5.03v and I have reduced the voltage to the chip to 4.1v and fed the reset via a 4.5K resistor not a direct connection. Any ideas anyone?