AWS Instance keep loosing status check

This is really scratching my heads off, not sure one of our instance running via AMI 'CentOS 7 -x86_64- with Updates HVM-7 2014-09-29' is keep loosing it's status check and machine becomes unavailable :( this happens for both 'System Status Checks' & 'Instance Status Checks' and than I have to Stop the instance and Start it again which makes it available but sometimes after several hours and sometimes within some hours(2-3)... 'System Log' via get systemlog option within AWS panel I get this: http://ift.tt/1Kk6Ngg and when I check via cat /var/log/messages I see file http://ift.tt/1IfUc7M

Can someone please help me in this... I am really not sure what's happening with my production instance! I have initiated several instances with 'CentOS 7 -x86_64- with Updates HVM-7 2014-09-29' AMI on micro and never had this kind of problem...