This is due to a few players with the username starting with ID_ deliberately crashing the game. There are a few posts on here regarding it. Please like them/comment on them to get the posts noticed by EA (hopefully).
Post by cautiousad78: EA fix ID overflow exploit crashing lobbies on Garden Warfare PS4 | EA Forums - 13744276
Post by Leancarp900: Garden Warfare 1 lobbies crashing on PS4 | EA Forums - 13711346
Post by homing-bling82 Gw1 Player crashing/disconnecting entire lobbies | EA Forums - 13674480
