Most issues are caused and resolved by Wi-Fi/internet speed issues. Run a local speed test on your phone and computer to see speeds achieved with your ISP / Router combination. Some ISPs have policies about creating static public IP addresses or lower firewall settings. If you are being provided a router by your ISP and find it is unsuitable, read more in "Router / Modem" article.
The Light Hotspot release has dramatically reduced the amount of data consumed by hotspots. Still, if you've reached a data cap, you can negotiate an increase with your provider. This primarily impacts off-grid hotspots with cellular routers.