Does Raspberry Rpi3B have polyfuse?
Yes, and if it is blown, you can replace it.
(1) If Rpi3B's polyfuse is blown, Can I save it?
(2) Rpi3B+ Power Circuit Analysis - James Adams, rpi.org, 2018apr11
Appendix A - Rpi Polyfuse Schematic
Appendix B - Rpi3B Polyfuse
FIRST: A low voltage warning that occasionally flashes on your screen is not really anything to worry about. However, if it is affecting the operation of your RPi, it does need to be addressed.
Adding capacitance is a reasonable approach to such things, but you probably shouldn't approach it in a "willy-nilly" fashion.
First, understand that ...
Ok so i'm answering my own question but by doing this post, I knew how to rephrase my research better...
I realised dnsmasq was overwriting the dns configuration, because the local machine was automatically set as the resolver.
Adding: DNSMASQ_EXCEPT=lo in /etc/default/dnsmasq solved this issue.
Found this post which explains it better: Proper way to prevent ...