Alice,
I believe there is a later revision than where you are now. The later patches, as I recall, addressed memory leaks.
Might be worht investigating if moving up to the latest Rev for 3.8.1 will take care of your issue.
Jim Kosloskey
email: jim.kosloskey@jim-kosloskey.com 29+ years Cloverleaf, 59 years IT - old fart.