Yes. You need an internet connection to use your Xumo Stream Box. A high-speed connection will give you the best results.
For WiFi troubleshooting, here are some ways to fix common connection issues.
What type of high-speed Internet connection do I need?
Most home broadband services work well, but you may need faster speeds or more bandwidth to watch higher quality content like in 4K or High Dynamic Range (HDR). Contact your internet service provider (ISP) to find out what’s available in your area.