The Roku Premiere was discontinued right at a year ago. That means we're likely up against warranty expiration, if it hasn't expired already. Unless of course you bought it from a retailer that had them in stock past the discontinue date. Your stating of "a few months" leans towards that. Find your receipt, just in case.
If it's still in warranty, it may be best to try to get a replacement. It's place in the lineup was taken by the Express 4K+, which is a better device, so you may come out ahead. Or they may replace with a refurbished Premiere, rather than attempt repair. Again, this is if it's still under warranty.
However, it's best to first work with @RokuDanny-R , @RokuKariza-D , or @RokuMary-F about getting it working ahead of that. They're tagged and one will reach out to you. Work with them about getting it running, or replacement if it's less than a year old.
DBDukes Roku Community Streaming Expert Note: I am not a Roku employee.
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I have the same problem, and it's driving me crazy. It will sometimes just go black every four or five minutes, for about 10 seconds, then when the picture comes back, it's very low resolution for a minute or two, before it gets back to normal... This doesn't seem to be happening on every channel, so far it's 380 & 775 that are doing it all the time. I have a TCL Roku TV and remote with voice ability, which only works about half the time. And sometimes the remote becomes completely unresponsive, I'll scroll through hundreds of channels, find one I want, then when I click the OK button, it just bounces back to the previous channel!
Seriously? Your ROKU Live TV doesn't have hundreds of channels? No, these are not cable tv channels, as I don't even have cable, their Roku's channels. You don't see all their ads about this or that station, on channel xxx?
Does the issue only occur on Hulu or across other channels installed on your Roku device?
If you haven't tried yet, you can remove the affected channel and then re-install it. To ensure the process is successful, make sure to restart your device before adding the channel back in. We would recommend doing this from the Settings menu by navigating to Settings > System > Power (If you do not see a Power submenu, skip to the next step.) > System restart.