[Elecraft] K3 stopped communicating with N3FJP log program and Elecraft Utility

[Tom & Barb Valosin]

Hello all - I am at a loss. First off - I am definitely not a computer 
X-pert, just a program user. (Not an Expert in anything - X is 
mathematical coefficient for the unknown and a spurt is a drip under 
pressure. Therefore, I am NOT an expert. Well, it was funny when the 
high school math teacher said it back in 8th grade>)

I purchased a previously loved K3, S/N 4734 from Rich, W2EG in Sept 
2016. He upgraded to the "latest and greatest" version of the K3. Before 
he would allow me to actually pay for the rig he wanted to be sure all 
was up to snuff so he sent it to factory to get a top to bottom check 
out by Keith, WE6R. Keith made some upgrades and pronounced it "meets or 
exceeds all specifications". Nice thing here - Rich did not add the cost 
into my purchase price. (If he ever says he has something for sale - 
fear not!).

The K3 worked great, communicated with rig control from the N3FJP 
logging program via Windows 10. Connected via the RS-232 connector on 
the rig. The Elecraft utility also worked well. Now (about 3 months ago) 
it started acting up. Lost a month trying to get it to work while on VK2 
holiday for a month. Now been back at it. The rig performs well with the 
exception of the communication issue. I have tried new interconnecting 
cables, run the interface to log on every combination of Com Ports, 
Rates, Parity, Start and Stop, Power, Polling rate and so forth. Because 
my son, VK2KDP is more computer savvy than I am, and the fact he has his 
station doing as it should and has helped other VKs get set up, I turned 
him loose through screen-share. No joy!

Suggestion please, or should I just pack it up to the factory?

Tom, WB2KLD / VK2RSG