["Monkey D. Luffy" <the.real.monkey.d.luffy@xxxxxxxxx>]

>> I bought a router but it stops working after a couple of hours,
>> sometimes a couple of minutes. The store told me they tested and it
>> works fine -_-'
>> [[snip]

> First things first.  Did you do a FW upgrade your your cable modem router?

Yes. I updated the router's firmware.
But I have not updated my cable modem's firmware (I think the ISP does that).