Also happens with a 9 year old Vizio and a 2020 Samsung. At first I thought it was the Vizio… So I bought a new Samsung and realized once I unplugged, completely, sometimes just letting it sit for a couple of minutes, it did the trick every time. It only does it however on my TV which is furthest away from the router.
The only thing that has worked for me every single time without fail is doing a system restart. It's a bit tedious I know but it works. Also, I've been finding I've been needing to do it far less than I used to have to do this so I'm wondering if there's something improving.