Not exactly the same issue but I've also had problems with wifi on my Samsung TV.
We bought one back in maybe 2015 and the internet was really slow and unstable. Dropped all the time. I bought a Roku just to avoid dealing with it.
This year my parents bought another Samsung TV after the old one died. 8 years later and they still don't have a good wifi connection. For example, Prime Video will lag and have low resolution on the TV but will play perfectly fine at 4k on the Roku.
Bought an LGTV and haven't had much problems with it for apps and wifi