Digital BW, The Print

Tryng to see if anyone else has had similar problems and might have ideas.  In printing 
with an installed CIS system ( which had been working perfectly ) the printer will just 
stop at a certain point  and you get the : Printing Aborted : Check for Foreign Objects" 
warning . 
    This had happened to me before . I worked with CIS support who thought the problem 
was with the printer itself . I worked with Epson  ( not telling them that it was a CIS 
system I was working with ) who after trying all sorts of printer resets , replaced the 
printer .
     All of this would point to just a printer problem except that the exact same thing 
happened a month ago. This is the new printer and a newly installed CIS system. I am 
beginning to suspect the chips that the CIS system uses? maybe a vibration causes them 
to lose contact with the printer. 
    So , any similar ideas , experiences , solutions , things to check for would be greatly 
appreciated . What exactly triggers the foreign object warning on a 1290 ? 

Thanks , Robert Lewis