Hmmm,
If you are willing to zip a few log file extracts from before, during & after the issue & post them here I'll have a look into this.
The relevant files would be:-
Login_events.TXT (Scripts folder)
HG612_stats.ini (Scripts folder)
ERROR.LOG (Ongoing_Stats folder)
ERROR.LOG_file_ERROR.TXT (Ongoing_Stats folder)
graphpd_ERROR.LOG (Ongoing_Stats folder)
modem_stats.log (Ongoing_Stats folder)
GRAPH6_ERROR.LOG (Current_Stats folder)
Current_ERROR.LOG (Current_Stats folder)
It might also be worth checking in Task Manager that there are no stuck instances of any of the programs.
Also, which version of Windows are you using?