Not viewed traffic eating up my bandwidth

Hi,

I′ve been having trouble lately in that I′ve been running out of bandwidth in the last three months. I have a 5GB limit on my pSek hosting site, and that seemed to be enough until 3 months ago; all of a sudden I started running out. I was surprised; traffic to my site is quite modest, and it hadn′t significantly jumped in the last months.

I checked my awstats and it turns out that more than 75% of my traffic is “not viewed traffic” this month.

I′m pretty new at this; can someone help me prevent not viewed traffic from eating up my bandwidth allowance?

I′ve already checked for hotlinking, but image files don′t seem to be attracting too much traffic; and I′ve checked robots and spiders – they′ve used up some 700 MB, but still don′t account for the 3,01 GB in not viewed traffic. That′s all the tips I′ve been able to find on internet. Please Help.

Thank you