Roku devices have no ability to control Internet access times. This sounds like a setting in your Internet router/modem. If your ISP is a cable company and you lease the modem from them, they have control over your box and might have changed something without telling you. If you know how to log into your modem/router, check for any time of use settings and make sure they're disabled. Some routers are capable of restricting access by device, so that would explain why your TV loses access but nothing else does.
Dan
Roku Community Streaming Expert
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