Thanks for providing your device info. I wish everyone would do that.
Please describe what you mean by "crashes".
These things are just special purpose computers, and just like their big brothers, sometimes operational problems cans be solved by a system restart. From the Roku home screen use menu path Settings > System > System restart. (On a Roku TV the menu path is Settings > System > Power > System restart.)
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the channel starts to launch never gets past the first screen, then goes black and I get the dancing Roku letters. Has happened at least a dozen times, with no successful launches. I have tried a system restart and unplugging the device.
Now that's a crash. I would try the "clear the cache" procedure - press Home 5 times, followed by Up arrow once, Rewind (<<) twice, and FF (>>) twice. If done properly your Roku will restart on its own. Check for updates from Settings->System->System update after it restarts. If that doesn't help, I think the only other option is a factory reset. I don't suppose you have another power adapter of the same model you can try?
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Mine too. It worked perfectly yesterday. I even checked for updates (there aren't any) and restarted. I am so very unhappy. As one who been dealing with this jacked up Roku since the 10.5 update but learned to live it now it's unusable? Does anyone have other ideas to fix it?