Thanks for looking Aerostar, but that does not seem to be the problem.
First I write 5 temperature values from the thermocouple in succession, and read each back immediately after it is written.
Next, I use the for next loop, incrementing one at a time, and that works.

It is the last for next loop, identical to the previous one, that does not work.

Still have not figured it out

Ken

ps I did try incrementing by two to no avail