I have at least a few a day, including one trying to access this thread! The worst time of day is exactly when one would expect it (6 p.m. to 11 p.m.). They're very annoying, but love endures all things.
P.S. They occur on all sections of the site for me (main forum page, threads, etc.). Also, as my serbian friend mentioned, the site in general has been running very slowly.