I have an FP2 which I bought in early 2016 and in the past 6 months I’ve been experiencing some major connectivity issues. When indoors I am often unable to make or receive calls and data transfer is effectively impossible. Additionally in places where I can get some data connectivity it seems to work only if the phone is perfectly still - such as lying flat on a table - as soon as I grab it the connection drops out.
I tried cleaning the contacts on the back of the display module using isopropyl alcohol as suggested in another post. They were indeed very oxidized but cleaning them had no effect. I also detached and reattached the antenna cable but to no avail.
Something that is particularly odd is the network indicator. It often displays full strength with the small H on the side when it’s actually impossible to even make calls - let alone transfer data. Then sometimes instead of solid white it becomes grey with black vertical bars, the same design as in older versions of Android. When it’s that way I have no network at all.
Is there anything else I can try? This is making the phone almost useless to me and it’s a shame because aside from this I have had no issues with it.