reply to kalg
Re: DLink 615 Wireless Router too Old? Believe it or not, the problem may actually be your DLink DIR-615 router itself. Depending on your hardware revision, you may need to disable Wireless N mode. Once disabled, you should notice your problem disappear. I can confirm this through my own findings with my experience with this router. Chances are most likely that you're running an older hardware revision, such as the A, B, or C... These are the most common revisions to experience this problem.
As always, you may find it beneficial to check the DLink website for firmware updates. Remember though when doing a firmware update that if you attempt it over a wireless connection, you stand a great chance at bricking your router. ALWAYS do firmware updates over a hard-wired Ethernet connection in order to avoid this problem.