Thanks Burdar.
I just got off the phone with DP Electrical.....the tech there told me he has seen this before on these starters and it is caused by the battery cable stud/nut being tightened a bit too much and then the innards of it moves a bit......works OK at first and gradually begins to burn the contact that moved a bit....then after a while and more burning it begins to do what its doing for me.....
The fix is to open up the small triangular plate on it, after pulling the starter, and remove the plunger ....sand the plunger a bit.....then check the two contacts (u shaped).....then loosen the stud, move the contact into proper position, then sand those contacts. Then reinstall.
I dunno...sounds easy enough but....
With the header in the way (will have to loosen/almost remove it) , its not just a bolt/unbolt sort of deal. PITA.
He did say it will gradually get worse to the point of not working.
Dammit.