Router constant crashes

Yes the crashes/disconnects stop when I connect my computer only to my modem. How can I check my internet connection data rate and how can I make it higher ?

If you are certain that the problem disappears when you connect directly to the modem then it is unlikely to be a problem wit the data rate. It would seem to indicate a problem with the router but if it is occurring with both wired and wireless connections and there is no problem with IP address leasing then I am out of ideas as to what might be causing it. If you can get you hands on another router to try it might help - if only to either confirm or eliminate router as the cause of the problem.

Well the problem is that this router cost me about 45€, which should be like 60 $, Im not sure. If it was for me, I would have bought another router a long time ago, but this one cost alot of money. I have tried to replace the cable that connect the modem into the router and it didnt fix it :S