We have experienced an issue with articles around 300 days and over. Retrieval of articles of this age range will give a variety of errors in your newsreader such as articles being corrupt, articles being missing or simply cause your newsreader to hang as it requests the article from the server. If the article is in fact available slow speeds will be evident.
Once we fix the issue that caused the errors, we will begin rebuilding the spoolset. We should begin doing this throughout the night tonight and into the day tomorrow. (Friday June 25th)