It’s not just routers or modems. Restarting is troubleshooting step number 1 for any computer.
Software isn’t perfect. Everything except the simplest of programs is basically guaranteed to have a bug. Catastrophic “crash the whole system” bugs are very rare. So the system can usually recover and keep on going. But sometimes, there’s still a bit of a mess left behind. Like some data stuck in memory.
After only one time, the mess is small enough to be negligible. But as a device remains on for days, weeks, or months, these small messes start piling up and start getting in the way. By restarting, you make the computer wipe everything clean and start again from scratch.
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