Trace output not getting logged in output file at times - trace

I'm using TextWriterTraceListener to log error messages to a text file.The TraceOutputFile has been mentioned in the web.config file as "trace.log.txt". The error messages are getting logged to the trace.log.txt. But at times I notice that some files are getting generated randomly under root folder with the exception details instead of logging to the trace.log.txt.
This is not happening in any particular page and hence I am unable to detect the reason as to why these files are getting generated.Ex:14dbc20a-9eb8-4fec-b6bd-54400db2ceatrace.log.txt .
Can u suggest me any circumstances when this might happen?

if you are familiar with ETW tracing, you could register EventProviderTraceListener instead of TextWriterTraceListener. You could details how to do that here.

I saw something similar when I had two threads trying to write to the log file at the same time whilst using the Enterprise Library logging classes.

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The same thing happens when I open and save an existing form (.fmb)
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I've tried saving it into a differ folder and also tried creating a new folder but it still throws the same error.
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CocoaLumberjack - how to access the log file on the device?

I am using CocoaLumberjack for my logging as it seems a very versatile logging framework.
In my application, I need to log to a file, and have the contents of that file displayed in the app itself: this is for diagnostics purposes for the user of the app (mainly so they can see how much the app is accessing their network, which I log to file).
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thanks!
See my answer here:
https://stackoverflow.com/a/11544657/620577
And these characters are just to reach the 30 minimum.