Tom,
I had the same exact problem with my OMNI 6 when I first got it 2 years ago. 
Ten Tec sent me a new firmware chip and also advised me on the cap mod, which 
was already in my unit. The problem was finally cleared up when I had them do 
the factory Option 3 upgrade to the OMNI 6+. Since then (more than 1 year 
ago) I have had no problems with the keyer jumping speed in mid stream. The 
service sheets I received back from them did not indicate what components 
they replaced to fix the keyer problem.
Good luck and I hope Ten Tec can fix the problem for you.
73,
Dave, K2DP, St. Louis
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