Help on Apache Log

Hi guys, looking at the file Error.log of Apache I find this error 
cyclically
*[Tue Mar 19 15:36:09 2013] -e: DBD::mysql::st fetchrow_array failed: 
fetch() without execute() at C:/PROGRA~1/OTRS/OTRS//Kernel/System/DB.pm 
line 616
Scalar leaked: 1*
Do you know why?

We have an OTRS 3.0.10 on Windows Server 2003 from about 6 months with 
200 Tickets per day and  we are having a gradual degradation in performance.

Thanks
Rocco

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