Your Task Manager looks different to mine.
Are you running Windows 8?
It seems odd that you have 2 ONGOING files created within 0.006 of a second of each other.
You don't have 2 versions of the program running on a schedule do you?
I ran 2 versions when testing & would occasionally see a few ONGOING files that hadn't been deleted.
If you are only running one version, maybe one instance of HG612_stats.exe had been delayed by something the PC was doing at the time.
Can you think of any resource hungry programs that may have been running at that time?
Could you post a snippet from your ERROR.LOG, say from 17:20 to 17:30?
What is Schedule_Test.TXT & does it run once every minute?
Do you see any unexplained gaps in any of your ongoing graphs?
Could you attach a copy of today's montage for me to take a look at?
Your ini file looks fine.
Do you ever see any 'stuck' HG612_current_stats.exe processes in Task Manager?
I presume modem_stats.log is still being correctly updated every minute?
BTW, What size is it now?
Mine is around 18MB & I don't really see any issues (but I have recently improved the efficiency of dealing with large log files).
Sorry, I mis-typed there.
I should have stated Mine is around 180MB.
It goes back to October 2012.