When gaming or just connected to the router I experienced reboots every few minutes.
I called D-Link support to encounter that the Tech was not familiar with the DGL-4500, had an accent that was not very understandable at times and got very frustrated quickly.
Every an hour the Tech was so frustrated he told me to return the router that it was faulty. I decided to do some research on this issue and found the problem.
The problem was 2 cables on my network connecting some devices. It seems that this router is mor sensitive than most. Until I changed these cables, the router kept rebooting and I could only connect using 10mbps. I changed these 2 cables out for the new Cat6 and everything seems to be good. The other thing I would suggest is to disable the ALG's on the firewall page. These caused me some reboots using my VoIP and VPN.
So far so good on using this router. The first part was very frustrating, however I hope this helps others in the future.....