Have customer that installs new toner ctg. then 2 maybe 3 wks later calls and tells me it is asking for toner again. Any ideas?? Firmware??

You want to check the copper connectors that contact the toner cartridge. They get bent out of position and lose contact.

yes
it is a firmware problem
that was problem when new model
I assume the machine have been in storage

upgrade to newest firmware and the problem will be solved. The usability of those already cycled toners in questionable but should work.

note most samsung have a ignored empty toner mode

Thanks, I will try firmware.