Not a Roku problem. I have 6 or 7 devices in my home, and there's no problem using any of them at the same time.
However, some providers limit the number of concurrent streams a user account may have, so it really depends on what you're trying to watch. Something like YouTube should be available on anything, all at the same time. Netflix limits you depending on what level of account you have. I can't know any specific numbers for other providers, but most have some sort of limit.
But if you're trying to stream something without a known limitation, or if you're trying to stream from different providers and you're still encountering issues, then yes you might be having networking issues.
Dan
Roku Community Streaming Expert
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