could be that the connection setup isnt correct?
could be the firmware needs updating?
could be there is interference from surrounding electrical goods, causing bad signal.
could be smart tv not very smart .... its andriod and samsung ... these 2 words dont go well together in my experience. i bet its sitting on the same ip address as something else in your household, causing collision/conflict.
finally, and i dont want to sound like im wearing a tin hat, but your IOT (internet of things) has an os, it can be infected with any manor of nasties, and no real way to av scan them.
i welcome all the nay-sayers about to tell you that tvs dont get viruses etc. right upto the point where a massive ddos from IOT devices makes the news again.