That model, from 2016, should be working just fine.
The responses you're reporting don't make sense. We're missing something. So, let's get some more data and see what's up.
Where are you? State should be sufficient.
Are you using a VPN?
How many apps/channels do you have on your Roku?
The Roku information and channel (app) information from this page:
https://forums.roku.com/viewtopic.php?f=28&t=44685Do any apps run correctly? Which ones?
Basil
https://www.basilsblog.com/
Roku Ultra (4660)
Apple TV (5th gen), TiVo
Previous:
Roku boxes from every generation.
Apple TV (2nd, 3rd, 4th gen)