HELP Really Unstable Wifi | TP-Link Deco AX3000 mesh (14–300 Mbps swings)
Hello guys, I could really use some help on figuring out what is going on with my wifi. It started acting this way about a year ago but always figured it was the ISP. I used AI to help summarize my notes. They were a mess.
I’m trying to troubleshoot really unstable Wi-Fi speeds in my home and I’m not sure if it’s my mesh system or configuration. Speeds just constantly fluctuate from 1.8 to 300 mbps
Internet setup
Cox Fiber (ONT in garage)
TP-Link Deco AX3000 mesh (3 units total)
2 story house (~2500 sq ft)
Main Deco downstairs
1 satellite in loft
1 satellite in next-gen room
All satellites are wireless backhaul (no Ethernet between units)
Wired performance tests
Direct from ONT/wall Ethernet: ~943 Mbps down / ~699 Mbps up
Wired into main Deco: ~912 / ~681 Mbps
Wired into second Deco: ~748 / ~453 Mbps
Wired performance is generally good and stable.
Wi-Fi performance issues
Wi-Fi from Deco system: ~13 Mbps to ~300 Mbps (constantly fluctuating)
Even standing next to the main Deco, speeds jump wildly (e.g. 14 → 300 Mbps → 80 Mbps, etc.)
Issue happens on multiple devices:
Windows PC
MacBook
iPhones
What I’ve already tried / confirmed
ISP / ONT is fine (near gigabit speeds direct)
Main Deco is fine when wired
Satellites also show “strong signal” in the app
Still getting unstable Wi-Fi performance everywhere
Turning the system into an access point only did nothing
Quality of Service is off
Tp Link Deco is up to date