MacBook Pro 2017 WiFi unstable

Hi!

So I am running this with Mojave, up to date, but very often the internet is just not going trough here. All other devices, phone, laptop running linux, and flatmates with their devices are okay, it's just this one mbp. MCS won't go over 4~, internet shows connected, but frequently pages just don't load forcing me to reload several times before I get full picture. No USB connected, no charger connected, NVRAM, SMC nothing helped. Restarting, nothing. I've seen other threads where people report exact same issue, though no solution.

Do I really have to get it replaced so often until I can fully refund it?