Weak wifi unless next to router

Hello,

I was recently gifted an LG K4 and at first it worked great, everything was perfect, no problems at all.. Then one morning i woke up to a bootloop (Phone just kept booting up and wouldn't charge) I decided to factory reset the phone, which fixed the bootloop but then i have a complete different problem.

My phone does not show strong wifi signals when in fact i know the signals are strong, my laptop shows the same network but with full-ish bars of strength. Its very aggravating. I only see strong signals if i sit right next to the router, i have tried rebooting and another factory reset but it didnt work.

Any help is greatly appreciated, i spoke to my phone network people whos said it was a software issue but it is not.