I think the solution is to return it. There seems to be a problem with these wireless receivers either being bad from the beginning or going bad in a short period of time. Since they're $20 to replace unscrupulous people have been know to buy a new stick, swap out the wireless receiver, and return the stick. Perhaps you got one of those.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee.