Update your routers firmware. Most of them have an update feature on their management page, but if you are unsure of how to update, go to the manufacturers website and find your model's user guide. Most routers these days ship with buggy code and it is not out of the ordinary to have to update the device to solve problems.
Bethesda's Todd Howard "if install base really mattered, we'd all make board games, because there are a lot of tables."
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