“Ultimate Facebook” name lookup timed out

I have upgraded to Version 1.5.1 on all my sites and i have seen an increase in time out errors in Ultimate Facebook.

"post_on_facebook exception CurlException: 6: name lookup timed out"

I am unable to determine where the problem is. some of the posts do get made to Facebook but it is less then 20% at this point.

i put another plugin in to test the posting to face book and it had no problems. so i am looking for some help.