hello guys one of my rb450g very strange issue in every 2 to 3 days the mik stops working all office, guest etc computer cant browse this 3rd time happen this issue, the way i solved the problem is to reboot the box 
i dont want to reboot the box in every 2 to 3 days, mikrotik staff can you please help me this issue what is the cause??
my box license:
[myron@Kamote] /system license> print
software-id: “9CR1-V147”
upgradable-to: v5.x
nlevel: 5
features:
packages ver:
[myron@Kamote] /system> package print
Flags: X - disabled
NAME VERSION SCHEDULED
0 system 4.5
1 dhcp 4.5
2 advanced-tools 4.5
3 routerboard 4.5
4 ntp 4.5
5 mpls 4.5
6 user-manager 4.5
7 security 4.5
8 hotspot 4.5
9 ipv6 4.5
10 multicast 4.5
11 routing 4.5
12 ppp 4.5