See our troubleshooting guide for first steps to troubleshoot your system.
If you experience slow internet consistently at a particular time, it is likely a congestion issue.
If you experience varying speeds all throughout the day and night, your modem may be frequency/band hopping. Search "band hopping" for more details.
If you are unable to connect to wifi, your router is likely failing and needs to be replaced. Remember to always restart your device (laptop, tablet, phone, smart device) and your router anytime you experience wifi disruptions.