Couple of things you might try to narrow it down a bit. Try one of the 2rd party Tesla apps (Stats for example), and see if they can connect. That at least would indicate if its the Tesla app itself or car connectivity. You might also try a car reset; this is a feeble fix of course (the old "if in doubt reboot the computer" chant of support the world over), but it has been known to fix issues like this.