siebel server process doesnt show sometimes

We are using  IP2015 15.18 i have a script which checks siebel server and gateway server processes

below is a snippet of the code using red hat linux 2.6.32-754.6.3.el6.x86_64

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Enterprise=BCF_DEV

Hostname=vdclascrmdev01

SS_Status=`ps -ef | grep "siebsvc -s siebsrvr -a -g $Hostname:2320 -e $Enterprise" | wc -l`

if [ `expr $SS_Status` -lt 2 ]

then

VFlagSS=RED

else

VFlagSS=Chartreuse

fi

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The code works most of the time but sometimes SS_Status returns value of 1 instead of 2 and it generates false alert that siebel server is down whereas it is not . Is there some setting which is responsible for siebel server going to background process when there is no activity ?