I don’t have the update yet, but I have a question about the WiFi discussion going on here: Do I understand it right, that the complaints are about the fact that the phone is toggling between 2.4GHz and 5GHz?
If this is the case: This is usually intended behaviour between modern phones and modern routers.
The FP3+ supports IEEE 802.11k, which enables phone and router to talk about the best possible connection; especially important if you have “repeaters” (nowadays: intelligent mesh networks). This standard is called Radio Resource Measurement.
Also the FP3+ supports IEEE 802.11v, which allows the router to tell the FP3 how to behave (which frequency bands to use, switching to another band, going to energy save mode, switching to another AP, etc.)
For example: if there is a PC doing a big download, the router will tell the PC to switch to 5GHz if SNR is ok to do that. And it will tell the FP3+ to switch to 2.4GHz to keep the band as free as possible for the PC.
And even if there is no other device demanding traffic, the router will often tell the phone to switch to 2.4GHz, especially if there is a bit of distance. The router knows that the FP3 is a battery powered device, it knows that there is (let’s assume) not much traffic going on, it knows that SNR is maybe not that good on 5GHz, so it tells the FP3+ to switch to 2.4GHz.
On the other hand: With traffic that needs low delay and high bandwith, the router will tell the FP3+ to switch to 5GHz - if this band and channel has enough ressources and it sees an advantage to use this band.
All these logics are especially important when using a mesh network (as supported by all modern routers). In this case there is not just connections between AP and devices, but also between APs, which need a wireless backbone channel which is dynamically controlled by the overall bandwidth in respective channels and bands in the whole network.
Unlike 10 years before, these standards are much more complex nowadays. By simply separating the bands (eg. naming the SSIDs different), most of these advantages are not working anymore.
Of course, you can do whatever you want with your router, but from a technical point of view, it makes all these logics impossible, which are needed nowadays in crowded (mesh) wireless networks.
So maybe I get the discussion wrong (please correct me!) but if it is about the FP3 switching WiFi bands without any obvious reason: That’s how these IEEE standards work.