When you restart your modem, it can fix some Internet connection problems, occasionally improve slow connections, and resolve common wireless issues.
To reboot a modem:
- Unplug the power and Ethernet cables from the modem. Some modems have backup batteries that need to be removed too.
- Wait 2-3 minutes for the modem to fully power off. All the lights on the modem should be off.
- Reconnect the power and Ethernet cables to the modem.
- Wait for the Internet light to turn solid, then check if the internet is working properly.
If problems with your modem still persist, contact your Internet Service Provider (ISP).
Network insights
Wi-Fi network insights may be available in your Google Home Activity 
If you received a related network insight, check your insight message below for more information:
Slow internet speeds
You’ll receive this alert when Nest Wifi or Google Wifi determines the internet is slow because of an issue with your modem.
Your modem provides the connection to the internet through your internet service provider (ISP). When your modem has problems, any equipment downstream from it will also have issues.
Fix: Follow the steps above to restart your modem.