The basic Express (not the 4K model) is a single band WiFi, so only 2.4 GHz. That is the most crowded band, and you might be experiencing some interference. There are 11 channels in the 2.4 GHz band that work with Roku devices (1-11), but only 1, 6 and 11 don't overlap, so you should be on one of those three channels. If you're already on one of them, try switching to one of the other two. If you rent your router from your ISP, they might have those settings locked out, so you may need their tech support to make the change for you.
Did you get a dud? With electronic devices it's always a possibility. If a channel change doesn't help, I'd exchange it for a new one. And for only a few bucks more, I strongly suggest the Express 4K+, which is currently on sale for $25. Much more powerful and capable player.
Dan
Roku Community Streaming Expert
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