Last Wednesday we changed the domain name of the Analytics cookie used on our online retail site to be able to better track our outsourced on-site search.
Following some discrepancies in the traffic origin we changed this back yesterday morning. Subsequently we have a vastly increased level of visits on our site - up to around 60,000/day from 20,000/day. Might we be double tracking somehow or something similar?
It may or may not be relevant, but we've introduced server load balancing in the past couple of days. Is this likely to have had any effect?