I have read the manual, albeit after I purchased the router, and discovered that a cordless phone and a DLink router is not a good mix. I tried many scenarios such as changing channels and the like to eventually taking the phone out of the environment. Unplugging the phone worked as the router stayed up for more than three days. The only advice the tech's at DLink offered was to buy a new 5GHz phone. They could not address the issue of why the router re-boots when the cordless phone interferes with the router. It would seem that when the phone rings "not answered" affects the router. I check the log file and it has reset when I am not at home. This is the most disconcerting part, the router re-boots and has taking as much as 20 minutes to resolve an IP from the ISP.
Is this a common occurrence for a DIR-615 or any other 2.4GHz router and will a 5GHz cordless phone resolve the issue.
Lesson 1: buyer beware of other wireless devices in your environment and the possibility of frequency interferences... Packaging does not address this eventuality...