WRT120N - repeated loss of connection requiring reboot

I have an old WRT54GL that has been really good over the years but it was becoming problematic and I decided it was time to get an N router. After a visit to the local PC shop I picked up the WRT120N and brought it home then proceeded to set it up. I got that done and I was using it set to G only as I have an older laptop that can't use N and the router only comes with 1x USB adapter.
After a few days I noticed the internet side of the connection would randomly drop out but I could still access the router wirelessly. Rebooting the router resolved it but it keeps happening regardless of if I use G or N. The confusing thing in this is that it works fine for a while and one laptop works all the time. If it wasn't for the fact that a reboot solves the problem temporarily I would consider the laptop's wireless chip at fault so it points to something with the router.
I've updated the firmware to the latest available but it still happens. Rebooting whenever it happens isn't a solution and unless Cisco have some solution I'm going to end up returning it.

I've given it a fair shot I think. After you posted I reset it to factory default then reconfigured it as well as removing the USB adapter from the equation. After almost two weeks the router has effectively dropped the connection twice a week, or three times in the past week. Each time the same thing will happen and the only solution is to reboot the router. The router is listed on available wireless connections, I can try to connect to it but it will fail for any device. Wired connections aren't affected but that isn't very helpful.
Wired connections seem to suffer a stuttering performance too where there's no throughput whatsoever for a few minutes but otherwise it works. Wireless performance is acceptable but these repeated instances of the connection dropping out mean that I'm resigned to taking it back for a refund.

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WRT120N - repeated loss of connection requiring reboot

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