asus rt-n600 must be rebooted often

[c55399]

Hi everyone and thank you in advance for any help.

I am managing a small network with an asus rt-n600 and 6 ubiqiti AP. once in a while we lose internet connectivity and have to reboot the router.

here is a pdf file with my router log a couple of minute before we lost connectivity (in red) and a couple of minutes after we rebooted the router (in blue).

https://drive.google.com/file/d/0B5SDv14tDJftWlVwNlhtSE1KSFE/view?usp=sharing

Any thought?