Mobile carriers network always has blind spots and you may experience such frustration in the suburban woods, on the trip or even in the crowded downtown.
Indoor cable WiFi is weakened progressively by each barrier between you and the router. It could be your basement, or the second floor bedroom, or maybe even a home office.
Network will have congestion during peak times.
So how do you go about fixing the connection issue? What is the best WiFi to invest in?