Peter,
>Randy, I surely admit that it looks like resonance, and I didn't check that with our customers involved. But yes, we have that (for some ages ... But hmmm, not tested ;)The fact that your problem was only happening at a limited number of locations was a factor that led me to suggest testing the cabling.
I'll be interested in hearing the results, should someone choose to do the tests.
Randy Bosma
VFP - Because life is too short to code in something else...