Link>
Welcome!What Hardware version is your router? Look at sticker under router.
Link>What
Firmware version is currently loaded? Found on routers web page under status.
What region are you located?
Try unpluging ALL devices, including the ISP modem cable and doing a factory reset, the connect 1 wired PC to see if it does the same thing?
Check the output voltage on the power adapter. Make sure it matches what is listed on the label. Might be 12v 2A or what ever is listed on the lable, if the power output on the plug that goes into the router isn't good then possible problem with power adapter.
You can try this:
Emergency Recovery ModeIf this fails then you'll need to RMA the router back to DLink.
Let us know how it goes.