I suspect corrosion at the end(s) of the WiFi antennae or a detached connector inside the FP2:
There have been some Wifi related pulls for LOS, which I can’t assign the 5GHz channel issues, but I’m hoping for improvements everyday ;).
AFAIK Android 6 was not suffering from any Wifi issues, that is one of the main points in the discussion that got lost over time.
Well, this one here is rather hardware related:
Yes it was, but it couldn’t be fixed by FP.
Actually the effect has a smaller impact on my battery life than I expected.
Checked both ends, but they are looking good to me. Neither corrosion, nor do they seem to be loosened. But wouldn’t it also be strange, that a HW-issue like detached antenna only leads to problems on specific Wifi channels?
While I agree, that the strong effect of tilting the phone sounds more like a HW-problem, the fact that only specific channels are affected does sound more like Firmware/Software/general HW-Design issue to me.
For what it’s worth, I’m having similar problems with higher 5 GHz channels on my FP2, in particular: anything from 116 through 128 doesn’t work. See my thread here for more details. After finally discovering the cause of these connectivity issues, I simply configured the router to use channel 56, and now all is well.