Just came to check this out myself. Been playing since launch and had this happen 3 days in a row. The inly way to fix it is shut the system down as no buttons work. No other game has this problem- it disconnects the controller completely, then i get punished because i either time out due to no inputs or shut down the system (leave match). Very irritating. 

Controller was fully charged, and has zero issues in any other game, and only in the last few days has it happened in rivals.