Latest Piwik 2.13.1.
Latest GeoLite GeoLite City (dated May, 06 2015)
Since havings theses updates I saw SEVERAL Piwik’s record missing!
I have internet shop with new order notifications. Notification has client’s IP address.
I have several cases that PIWIK loses some visitor’s visit history.
Apache Server log has this info, but PIWIK has lost.
Do Not Track feature is disabled. Site’s traffic is about 600-800 visitors per day
The problem appeared after last Piwik’s update and/or GeoLite DB update.