Kicking out of game and poor response

Why after all this time after spending soo much money on the game do I still now and then get kicked out of a game either winning or losing and getting it classed as a loss and a DNF against me when I have Ethernet connection and no issues with other games, my objectives are always saying I have some to claim when I don’t, the last few weeks gameplay has been sluggish and poor response from controller input or random player select, random game freezing when doing sbc or if players quit out of rivals the game can also freeze needing to restart the game. This is poor for a game which has such solid foundations