cupsd service high memory usage

I’m running Ubuntu 16.04 with cups installed for printing. I’m observing that the cups service is gradually increasing memory and reaches 100% in few hours of time.

Could someone help me to find what the actual reason could be for this high memory usage ?

Version informâtion :

apt-cache policy cups cups: Installed: 2.1.3-4ubuntu0.9 Candidate: 2.1.3-4ubuntu0.9 Version table: *** 2.1.3-4ubuntu0.9 500 500 xenial-updates/main amd64 Packages 100 /var/lib/dpkg/status 2.1.3-4ubuntu0.6 500 500 xenial-security/main amd64 Packages 2.1.3-4 500 500 xenial/main amd64 Packages