Test near the router and, if possible, compare Ethernet with Wi-Fi using the same service. Repeat on a second device and at another time to isolate the bottleneck.
Use normal shutdown procedures, keep hardware dry and stop if you see damage, overheating, burning smells or any electrical risk.
Checks to perform in the right order
Start with simple, reversible checks. If one step fixes the issue, stop there instead of changing unrelated settings.
Confirm the exact symptom
Distinguish low throughput, high latency and dropouts; they are different symptoms and need different evidence.
Start with the simplest reversible check
Compare a test near the router with a wired Ethernet test when available, using the same server or service.
Change one variable at a time
Repeat on a second device and at different times before changing channels, bands or replacing the router.
Cross-test before resetting anything
Write down what changes and what stays the same. A controlled comparison is more useful than several resets performed together.
Escalate with useful evidence
If the problem survives the safe checks, record the model, software version, warning shown and tests already performed before contacting support.
How to narrow down the cause
- A change after one controlled test is a useful clue; keep the other variables unchanged.
- If a second compatible device works in the same setup, focus on the first device rather than replacing everything.
- Stop if there is heat, liquid, physical damage, burning smell or electrical risk.
Official sources used
Procedures can vary by model, firmware or hardware revision. When your device differs, use the official manufacturer documentation for that exact model.