Swindon manager Danny Wilson accused his under-performing side of having a "soft underbelly" after the Robins slumped to a comprehensive 3-0 defeat to Charlton at the County Ground.
A first-half Johnnie Jackson strike gave the Addicks the lead before second-half strikes from Joe Anyinsah and Paul Benson sealed three points for the Londoners.
The Robins' latest setback leaves Wilson's side mired in the relegation mix-up and with an unenviable record of 13 goals conceded in their last four games.
Wilson, who kept his side in the changing room for an hour after the game, said: "I had a frank discussion with the players. We have shown a soft underbelly.
"We have not dealt with their strikers and even though we've had chances, overall you've seen a team who haven't helped each other out.
"There were countless little exchanges we lost, our decision making was poor, players didn't want to get into good positions and we played like a team who are low on confidence. We have to regroup and I hope that we can bounce back."