I just finished setting up a custom router with dns ad blocking. Next comes a media player so I can purge this smart TV filth from my household.
Huge shout out to Louis Rossmann and the FUTO communuty contributors, check out the wiki on self-hosted software if you haven’t already.
I bought a new TV last year after my Hisense kicked the bucket and had a similar experience.
Not sure if it applies to your situation, but I just factory reset my TV, never enabled wifi, and hooked up a smart device I had lying around (Nvidia Shield). Now it all works great and if the smart functions upset me I can throw just the smart TV part in the trash and go back to my VCR.
You have to reject smart TVs at the time of purchase, or manufacturers think this shit is okay and will keep escalating until even an Nvidia Shield won’t save you.