Digital BW, The Print

I have been printing today with my R2400 with PK on EPSG paper 13x19" 
size and have noticed on two prints that there is a "drip" of black ink 
on the print a few mm in diameter. Luckily on the first print the drip 
was outside the image area on the border which I will trim. On the 
second print there were two drips right in the image area.

I have run nozzle checks which are perfect.

Never seen this before and am wondering what to do before I waste more 
ink and paper.

Thanks for any help you can give.

<A HREF="http://www.scottjonesphoto.com">www.scottjonesphoto.com</A>.