Question 1 - is "/A/sub/$strTName" a file? If so, you probably need to open it with open ASUBFILE, "</A/sub/$strTName"
Question 2 - is $strTName defined? Try to insert a print statement and print out the $strTName variable.
Question 3 - Why is there a reference to $strTickerName, not $strTName?
The behaviour you have described happens most likely when you read past the end of the file, which happened to me a few times in the past.
If you are running the script under Unix environment, you could try out the execellent 'ddd' debugger. Which does a good job at debugging perl scripts.
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