It keeps happening once in a week (or two weeks): suddenly the connection gets lost and the router tries to reconnect every 3/5 minutes. Once acquired, the connection holds for few minutes. I can only turn off the router and see if it works 2/3 hours later.
My problem seems similar to that one discussed here and related to firmware version.
My router is updated to V1.1.00.25. In the downloads area of my model I cannot see previous firmware versions available. Moreover, if I download the latest one and the try to upload it on the router interface, I get an error response: it seems to expect a .img file, although the downloaded zip contains only a .chk file.
Obviously I called my ISP and they told me the problem is router-related so they can't help me.
From the logs I can see only false positive DoS attacks happening together with connection dropping (a problem already known to the community).
I really don't know what to do, except buying a new router.
