How do I know if I need a new modem or router?

How do you know if you need a new modem?

1. You can’t connect to the internet.
2. Your Internet connection randomly drops out.
3. You frequently have to reset or restart your modem.
4. Your streaming is lagging.
5. Your internet speeds are inconsistent.
6. Your modem’s indicator light remains unlit.
7. Your modem runs constantly hot.