What do you mean by decreasing?
This sounds like a leaky / bad programmed application
or more likely a computer-virus.
There are many free online-scanners available
TrendMicro, McAfee, Symantec
http://www.kaspersky.com/virusscanner
http://housecall.trendmicro.com/
http://www.bitdefender.com/scanner/online/free.html
http://www.eset.com/online-scanner
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