This is probably the biggest issue with the SH3: The Dual-Band WiFi is totally unreliable.
To cut a long story short, you can follow some simple rules to maximise the strength and quality of signal with the SH3, and its dual band WiFi.
Setting Up the Dual-Band WiFi
Visit the intranet admin page at http://192.168.0.1 (or wherever is appropriate for your network), via a browser.
Wait for it to load (the intranet web page for the SH3 is markedly slower than that of the SH2), and then log in using the admin password
Locate the following settings page: Advanced > Wireless > Security
Change the SSID for VMxxxxx_5G connection for 5GHz connection respectively.
Press Apply Changes
Give the SH3 a minute to update these changes, power cycle if necessary
Use the correct band of WiFi for each device
Newer devices that support 5GHz WiFi
ONLY if said device will be near to the SH3
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Red (VM SH2 AC Beta tester)
Running on 1Gbps VM service with SH4 in Modem Mode, with a ASUS RT-AC5300 router. With this setup I get Fantastic WIRED and WIRELESS Signals in my home. I dont work for VM. But I work in IT, and I know my tech.
My advice is at your own risk. If you are happy with my answers please press Kudo ?