System rebooted because of kernell failure

RouterOS General
1

for some time I get this error, of course after a wile the system hang. It worked well for about 6 month with 3.11. No system change until this error.
kernel failure.JPG

2

look here
http://forum.mikrotik.com/t/3-11-kernel-failure-still-here/22311/1

3

but for me this configuration worked for 6 month. This is really strange.