Thank you, Mark. I would have thought if it was the power supply then the issue would arise spontaneously at any time and not just precisely when I try to enter a frequency limit. But I may be wrong. For sure the keys are very dirty judging by the amount of pressure required to get them to actuate, so I shall clean them first in any event, since they certainly need it. I'll follow up with the other tests once that's out of the way and if the problem persists.
?
J.
Jinxie