In my fourth season I suddenly can't go to a match anymore. Everything else works but not that. If I go on holiday for a day everything works again until I have to go to a match. Saving and reloading did not fix it.
Can you try powering off your device and then starting it up again - this might fix the issue, its generally caused by a device getting extremely low on memory or having attempted to load a save game with a particular style of corruption.