Problem with the WiFi on my LG C4

Hey so I just got an LG C4 a couple of days ago and the wifi just seems to be really bad and I'm wondering if there's anything I could do to fix it!

I can't watch anything in 1440p or 4k because it lags too much. My PC which is also on wifi (and sits right beside the TV) can watch them without a problem.

I have Bell fibe 500 (500 mbs upload/download)

I'm the only person in my appartment

I just put a pcie wifi card (wifi 6) in my pc (which sits right beside the tv) and get 161mbps download and 183mbps and no problem watching 4k vids.

Meanwhile when I'm on youtube on the C4 and look at the stats it says my connection speed is 4000kbps which is about 4mbps

I also noticed the C4 to be laggier in general than what I would have expected for a new TV

Aniway is there aniway I could try to fix this issue? Did I just get a defective tv? Would the G4 also have these issues?

I'd rather not have to use an ethernet cable (which is why I got the pcie wifi card in my pc) And I shouldn't have too since my pc's wifi is totally fine.

Thank you for your help!!

Edit: I just went and forgot my network and reconnected to it and it seems to have fixed the problem (atleast for now).

Any reason why the connection got worst over time? (it was fine the first 2 days when I got the tv before it got bad and I had to forget/reconnect to network)

Any way to make sure it doesn't happen again?