I already tried to restore the factory settings, didn't work unfortunately. I will try to use my iMac as a gateway to the router, but I don't think it will do any difference.
I thought concrete walls wouldn't make that much difference because our neighbours wireless signals are just better than ours. we of course dont use them but I just wanted to check the signals. But in the manual it was mentioned that concrete walls might diminish the signal.
I went to a store and told them about the problem, they suggested the 5 dBi antennas, and though it made a little difference it obviouly can't stop the router from crashing. All of a sudden, the connection goes down. When I try to connect again from my mac, it says it can't connect to USR9106.
We thought about getting a new router as well, and it will be the way we choose to go, but these things cost much more money than they do over in US. I'd want to choose a decent router and quite honestly I'm not that good at this kinda stuff... This means, I will need your recommendations badly
Thanks for the fast reply...
Edit: btw, my asking for a refund is out of question because it is nearly 1 year since I bought the device. These problems were not so apparent then and we didn't need the wireless that much.