Your weirdest Ethernet issues may have nothing to do with your router, cable, or Windows
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When Ethernet connections behave erratically, most people blame the ISP, router, cable, or Windows settings. However, there are less obvious culprits worth investigating: an outdated BIOS can cause firmware and power management instability; a faulty RJ45 port on the router or motherboard (not the router itself) may be the weak link; running LAN cables near a UPS can introduce electromagnetic interference; and improper cable crimping (bad termination) can force a gigabit connection to drop to 100 Mbps. These fixes are generally inexpensive and worth trying after exhausting the usual suspects.
Table of contents
An outdated BIOS could be the hidden culpritA faulty port on the router or motherboard can cause a flaky connectionRunning your LAN cable near a UPS can create interferenceA bad crimp might be the problem, not the cable itselfSort: