We can't stress that headline enough: don't let your DualShock 4 run out of battery while you're playing Helldivers. According to reports that Kotaku received, users who let their controller die, and then plug it back in, can have their Helldiver replaced by a level 1 character.
This apparently overwrites your progress, effectively resetting your character and unlock progress completely, if you get to a checkpoint without restarting the game.
Developer Arrowhead is aware of the particularly nasty bug, however, and has stated that a fix is coming in the title's next update. "Don't switch controllers if your battery is running low, just connect it to a cable, and wait until you are on the bridge and done with saving before switching to another controller," the studio advises.
Have you come across this unfortunate issue, or are you just thankful that is hasn't happened to you? Radio in to the comments section below.