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Welcome!- What Hardware version is your router? Look at sticker under router.
- Link>What Firmware version is currently loaded? Found on the routers web page under status.
- What region are you located?
Its recommended to try the 868L router before updating. If it works, don't fix it.
FYI, there was only 1 build of FW for the DGL-4500 that is some issues. Other than this, it depended upon which Rev you had that it would not work well. There could be other external or user configuration conditions that could be effecting 4500 or any router.
I've had the 4500 soon after it came out and have never had issues with it. The 4500 is a rock solid router. One of the best that D-Link ever same out with. I have 3 of them.
If your going to update FW, please always follow this:
FW Update Process