I installed a wifi system in my home. It consists of a Tp-link router
TL-WDR3500 plus a Tp-link AC 750 range extender. My two desktops connect
with cables to the router. The wifi is supposed to cover the rest of the
3300 sqft single-story house.

Without the range extender, there were several dead spots in the wifi
coverage inside the house. After I installed the range extender, the
connections improved greatly.

However, the system fluctuates in coverage. In the same spot, one moment the
signal is "poor", the next moment it is "good" or "excellent". I measured
signal strength both with my smart phone and with my tablet.
What can possibly account for the fluctuations in signal strength, though I
am not making any changes to the system??

Customer support comes directly from China and is troubled by the fact that
they hardly speak any English.

Thanks for any input.

Walter

www.rationality.net