RB450g and problem

Hello to all .I have a problem with this

My hardware is rb450g
OS : 5.16
firmware:2.39

After 5-10 mins when users using hotspot is crashing the router and at log i take this

jan/02/1970 00:00:50 system,error,critical System rebooted because of kernel fail
re

what can do to fix it ?

if you want to post config please tell me

Have you over clocked the router to 800mhz?