Connections Log overwritten

Hello.  I used to be able to track the connection time for remote control looking at the Connections.txt file, but the only one now showing is the one from last week and all the past years of connections are now gone.  Is there a way to get those and why did they get overwritten at the end of February?  Can TeamViewer provide them as I use them to log and track the hours I spend helping others (so I can bill them).