Does your router have Gigabit ports on the LAN side, or just 100 Mbit ports? Not all routers have Gigabit Ethernet.
25m is a bit of a long run, does it go through any possible points of interference, like fluorescent lights, etc.? You may also have to change some of the Network Adapter settings, enable Jumbo Frames, disable any "Power Saving" mode, disable "Efficient Ethernet", etc.
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