Thank you. I ordered a Roku Express from Amazon and received it today. Model number 3960R to replace the 3930* model with the slow connection. It can connect to 2.4ghz and 5ghz networks. My connection speed is now 88GBPS. So, I guess I will be purchasing two more to replace the other older models that I have.
I would still like to understand why my Spectrum wifi 2.4GHZ didn't have any issues but the FIOS does.
If you don't mind spending $7 more per device, the Roku Express 4k+ (3941) is still on sale for $25. Comes with better hardware, memory, and a Voice Remote. https://www.roku.com/products/players (can usually find in stores for same sale price when promotions are running).
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As for your Fios, you may want to try going into the 2.4ghz band and just enabling 'n' and see if your 3930 devices can connect. If not, try g/n. Eliminating some of the slower protocols like b and g may help speed up the 2.4ghz band. (need to find the sweet spot of connection and speed).
As Strega2 indicated though, the newer Roku devices have improved hardware and should perform better on your network.
