I have an issue with the Wifi connection, but it is only problematic when I'm connected to 2.4Ghz networks.

My laptop is running with a Intel(R) Dual Band Wireless-AC 8260.

When connected to 5Ghz networks no problem at all, but when the laptops connects to 2.4Ghz networks the internet either does not work at all, or it is at such a low speed it is impossible to be productive. Especially if I'm not near the router as it then automatically shifts to 2.4GHz due to better signal.

The issue is present with any network - not just my home network. I have no issues with other devices (PC's, Mac's and smartphones) at home; only this specific laptop.

I have chosen 5Ghz as the prefered option, and the driver is up to date.

What to do?

It sounds to me like one of the antenna wires on the internal network card is loose or disconnected. I replaced the network card in my Yoga 3 Pro recently and was surprised to see that these antenna wires have such flimsy connectors. Super easy to pop them off, not so easy to put them back on. I ended up securing both antenna wires with tape after getting them reconnected.

Did that solution help? I'm having similar issues with a new Yoga 730 13". I'm not sure if my issue relates to all connections having both 2.4g and 5g, but I know that I'm having horrendous luck connecting to my home network with the 2.4g option. I have great connectivity with 5g only. Speedtests confirm this consistanty. Please let me know if this solution helped, as I can then be more assured that opening up the laptop is worth the effort. Thanks, -Tim

stick to 5 Ghz the 2.4 Ghz is so overcrowded that its unusable now, i have all my machines setup to use 5 Ghz myself.

That is my plan for the present. However, I am having little other issue with all other computers, laptops, pads, etc in my home environment using 2.4ghz. The Lenova Yoga, with the Realtek 2x2 card, is what is at issue. I've ordered a replacement Intel Dual Band Wireless-AC 8260 to replace it. I've learned that many are having issues with the Realtek card. It may be a week or so before I can update this thread on any likely improvement. While it seems incomprehensible that I need to operate on a brand new laptop in such a fashion, it is of less hassle than returning it.

I don't take this solution lightly, as I believe Lenovo should have spent the additional $3.00 providing us with a card that far out performs the origional - at a fraction of the cost. My biggest concern about holding to the 5ghz connection only, is that while this would will fine at home, there is the likelihood that the Realtek in connection with Dual-banding is the real culpret beyond that. If that be the case, it's possible that all connections offering both 2.4ghz and 5ghz (with 5g having no SSID announcent) would result in the same situation.

Thank you for your response. I'll report back with my findings. -Tim

I bought a bunch of Realteck 8821AE cards for my old Lenovo machines and they work great at 5 Ghz

I can post screenshots of how bad 2.4 Ghz is from my Wi-Fi analyser if you do not believe me that 2.4 is a joke

Thank you. But you're likely missing the point. 5ghz isn't always available. In fact, it's rarely available in motels, hotels, coffee shops, work environments, etc. 2.4ghz MUST have its place. Realtek with THIS Lenovo 730 is useless, but doesn't have to be; hense the replacment. -Tim

I only use dual band Wi-Fi cards, some cards Lenovo have supplied have only 2.4 Ghz capability and I explicitly bonk Intel for that as the 802.11n standard is for dual band

I use 5 as it is faster than 2.4