Pics and opening information gotten from
https://www.ifixit.com/Teardown/LG+G5+Teardown/61205 !
Great site for phone repair info and teardowns.
There is a fair few comments relating to this model and Wifi/Bluetooth issues btw, not a super high amount but it isn't a unique to you issue to be sure.
Why not check me out on youtube and help me on the way to 2k subs over at www.youtube.com/stormcloudlive