@Alup
As this is your first post here, we users here at the user forum don't know any of the details. So, until you give us information such as your Roku model number and OS version/build (Settings > System > About), we're flying blind.
If you have a Roku Express model 3930, and if your wireless router is from an ISP (that is, you don't have your own and don't manage changes), then it's possible your ISP changed the wireless settings on the 2.4 GHz band from b/g/n to g/n, which will cause what you're experiencing. Give that a look.
Someone from Roku, perhaps @RokuMary-F , @RokuKariza-D , or @RokuDanny-R will be by, and they'll generally tell you to keep working with those with whom you've already contacted. But it's been three weeks. They may decide to step in (and on the toes of those in the other departments) and try to assist. Work with them if they do, and stay in contact with them. But do gather the model number, OS version/build, and anything else that might be helpful (error codes, error messages, screen shots of same) and expect them to reach out. They are usually very good about that.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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