jasminz
To stay on topic, what is the true news value here?
Powerline networks are mainly utilized by people living in concrete multi-story houses that either do not wish to install a proper Ethernet backbone to all rooms or take a gamble with WiFi due to higher cost, thickness of walls or other reasons that might seriously affect connectivity as mentioned before.
I used to run my own IT support company with several employees (think Geek Squad) having both enterprise customers aswell as private sector and people running Powerline is actually a lot more common than you might think (my parents for instance are running it along with WiFi in their house - deskop, IPTV and camera surveillance is on Powerline while tablets and phones are on WiFi).
During all my years in IT I've encountered two situations which I can remember where WiFi was used on a desktop machine instead of Ethernet or Powerline - one was a car dealership where they had a salesman sitting in a "glass box" and they were sharing building with another company (so, no Powerline) and other situation was a enthusiast that built himself a new computer and his new Asus motherboard came with 802.11n built-in..
Personally, I am running all my desktop machines on a 10Gbit CAT6a network I have at home (I do have a WiFi as well but it is on another VLAN with no access to network infrastructure - mainly used by kids) where I have possibility to stream multiple 4K streams from my FreeNAS server while downloading huge files of the Internet without even breaking a sweat - try to do that over a WiFi connection and you'll hit into a brick wall pretty fast.
Anyways, I did what most people do not do and unlocked bootloader, installed TWRP and Pure Nexus Project 7.1.1 ROM and am happy to report that issue is now completely gone (I did stress-test it several times in below zero temperatures) !
So, no - it does not seem to be a hardware issue.