Probably. You might want to try a different USB power adapter and/or cable. I've mentioned before that the 3920 is by far the worst Roku device I've ever owned (and I've owned most of them). I got more life out of mine by taking it out of its case. It still has terrible Wi-Fi reception, but it's working if you don't mind a naked Roku.
By the way, the 3920 isn't an Express, it's a Premiere, but you'd be hard pressed to tell them apart by looking at them.
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