Losing network connection - cannot repair

I have installed router and set up wired base station and wireless remote station (in next room). At random intervals both computers show no connection to internet. Running repair connection goes through steps and shows computers still not connected. Using Network Magic to repair results in instruction to unplug router, wait 10 seconds, and replug router. This works and both computers are then able to access internet.
How can I change setup, if necessary, to avoid dropping connection to the ISP? ISP is Comcast and router is WRT54G2 V2. I used Network Magic to do setup, changing my network name and otherwise using defaults. I had set sharing of printers, but have removed this.
It is excessive to have to drop power to the router to keep network working.
TIA.
Gary
Solved!
Go to Solution.

Open the router setup page and Under the Setup tab..Change the MTU to 1350 and click on save settings..Now,power cycle the router and check the connectivity...

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