Map where the connection fails
Use the same device near the router and in the affected room. Note whether all devices fail there or only one. The result helps separate coverage problems from device or internet-service faults.
Try a safer placement change
Check ventilation and a practical open position for the router, then repeat the same test. Walls and interference affect results. Moving equipment can help a specific path without guaranteeing whole-house coverage.
Choose the link the room needs
A cable, access point or mesh node may be appropriate. A wireless node placed where it has no usable upstream link can remain unreliable. Confirm compatibility and cable options before purchase.
Check after changes
Test calls or other tasks in the problem room, not only a speed test next to the router. Record positions and results so later faults can be compared against the same conditions.
Questions about this guide
How can I confirm that a room has a coverage problem?
Compare the same device near the router and in the affected room. Note whether other devices behave the same way so a device-specific fault is not mistaken for poor coverage.
Will putting an extender in the weakest room solve it?
An extender needs a useful connection to repeat. Test a position between the router and weak area, and consider wired access points where the building prevents a reliable wireless link.