Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I fear that my one idea, after examining your case, may seem too elementary - and I may suppose that you have already checked on this detail. But nonetheless: Be sure you have checked whether your own computer is set to the correct time, as far as the minutes-after-the-hour are concerned, and also that your computer clock and your broker software are also set on the correct time zone (or at least both on the same time zone... I am not sure how time zones are handled in your software, but I would think they would both have to agree.)
This may sound too obvious, but there is a technical detail to the suggestion. Which is, that computer clocks may run slightly fast or slightly slow, compared to other computer's clock or regular clocks, and in rare cases might possibly vary or spontaneously change at times.
Also check whether your computer is running far too much in the way of other processes, or perhaps running 'Scheduled Tasks' during these periods of lag. In Windows computers, Scheduled Tasks are listed in
Start - [All] Programs - Accessories - System Tools - Scheduled Tasks.
Or, in the simplest way of dealing with the possibility of Scheduled Tasks slowing down your computer at times, you could just shut Off the Task Scheduler Service in Services... let me know whether you would like to try this and I will instruct you how to do so.
Another good idea is to do a thorough set of scans of your computer for malware, viruses, adware, or spyware. And eliminate all of that sort that is found... some species may be using your internet connection to 'dump' data to some other server, or similar activity, and malware etc. is seldom polite about such monopolization of your computer's resources. The section below details some measures to take against the possibility... and if your computer has no security suite, I may recommend either Symantec (not cheap) Internet Security, or if you prefer free-of-charge, there's AVG Free or Avast, etc...:
1. Go to http://www.safer-networking.org/dl/
download Spybot Search & Destroy 1.6, install it, update it fully, run a complete scan, and tell it to Fix whatever it finds wrong.
(Note: this is now also available free, in version 2, for Home users [in a non-business context] and that might be better... but I have not tried it yet so I can't say from experience.)
2. Go tohttp://download.cnet.com/CWShredder/3000-8022_4-10301587.html
and when you click on the green 'Download' flag at left, you then need to look for a yellow flag reading
Continue To Download
which is what you should click on, not those other products displayed on the page.
Then (unless your browser blocks the download) you should be offered TrendMicro's CWShredder.exe, to Save to disk (saving it to e.g. the Desktop, where it will be easy to find). Run CWShredder by double-clicking on its paper-shredder icon, agree to the license, click Scan Only, watch as the results scroll up... if all entries say "Not present", then nothing of the sort is present... but if one IS found, choose Fix on this scan or the next scan (if the next scan, start the scan with the Fix button instead of the Scan Only button.)
3. Go tohttp://vil.nai.com/vil/stinger/
and download Stinger at the link next to the number 1. , below the question "How do I use Stinger?" Save to a location where it will be easy to find its orange and yellow square icon:
and double-click on it to start it. Configure it in its Properties to scan boot sectors (as well as all the other things), select scan area (probably just C:\ would do), and start scan. It may find nothing, but if it finds anything, that's cause for concern.
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