I urge you to find a cause for this problem. If this issue can be reproducible, then you will surely able to find a cause for the lack up. Otherwise you can try pin-pointing it. I have seen many routers which are lacking of resources and may lock up when there are many connections which it cannot handle. However to reboot, you can try using the wget through the WebUI like this
Code:
wget -v --no-check-certificate --http-user=admin --http-password=password --post-data="reboot_ap=1" https://xxx.xxx.xxx.xxx/ureboot.htm
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