WRT120N crashing inet connection HELP PLZ

Hello,
I am using WRT120N with latest FW 1.0.04 and I am having big problem with my internet connection. Inet goes down 2-3x times per one day (I am not online whole day, so it may by even more offen). Suddenly, no matter if I am working on PC or its in idle mode, my inet goes down and only thing that help is 1) restart router or 2) release IP and obtain it back right after.
I am using UPC inet provider with dynamic IP (so its Automatic Configuration - DHCP), but I have the same external IP for more than 2 months now. Before I bought WRT120N I had Airlive router and it was OK, so I am sure the problem is in WRT120N somewhere, Can someone help me plz? I am really mad about that.

Hard-reset the router and re-configure the router settings from scratch..Open the router setup page and reduce the MTU to 1300 and click on save settings.Power cycle the router and check.

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