@KimcheeGUN Thanks for the feedback.

> By chance are you double nat'ed?  Is your ISP modem in router mode?

No, I don't believe so. I did a trace route test, there was only private IP address (belonging to the router) before the request reached my ISP.

I should point out, since Tuesday when I made the original post I've been using an old, cheap wireless router instead of the new WAP. During that time, my router has not failed. But I don't see how a WAP would cause a router to just stop working...

  @Clive_A I tried updating the firmware, as you suggested, being sure to check the hardware version and region. However, the update failed with no explanation why. The failure message just said to "check the file".

  @friendofdog 

Last time I had the "Update Failed" message was when I was downloading wrong version of Firmware (the device was described as Netherlands' and I was downloading Firmware dedicated to my - different - region).

The best option was to choose universal version of firmware.

Not sure if that helps in you case, just check it if you can.

Information about device's region I've found on it's box.

Cheers.

  @RaRu Thanks, but the version I'm referring to is the same as the universal one. @Clive_A had previously referred me to that one.

I checked the system logs, and this happened 158 times today prior to the router crashing/restarting:

DHCP Server allocated IP address 192.168.0.xxx for the client[MAC: 1a:2b:c3:d4:56:ef].

Is it normal? My DHCP lease time is 2 days and there are only 13 clients, so I don't see how it could be normal. What's happening and is it pertinent to the problem I'm having?