The best way to try to diagnose this sort of problem is to start with a very simple configuration, and slowly build up from it. I suggest that you clear out any current DSLstats files (including the configuration files) and install version 6.0.2 using the self-extracting installer. Don't change the installation folder from the location offered by the installer. Don't change anything in the configuration, apart from entering your modem login details of course. Run it like that for a couple of days if you can. After that, slowly add the features you want, testing each addition as you make it.