Post-match reaction from the Goldsands StadiumMillwall boss Steve Lomas said his side were guilty of a "mad 15 minutes" at the start of a second-half which saw The Lions concede three times as Bournemouth came from two goals down to win 5-2 on the south coast.
Early first-half strikes from Martyn Waghorn and Liam Trotter gave the visitors a commanding early advantage, but Ryan Fraser halved the deficit for The Cherries on the stroke of half-time.
Then, in a surreal start to the second 45, Steve Cook headed Eddie Howe's side level before Harry Arter put the hosts in front. Minutes later, former Lion Lewis Grabban converted a penalty after Alan Dunne was penalised for handball, and subsequently dismissed for a second bookable offence.
Substitute Brett Pitman's penalty then made it five in stoppage time, and Lomas was extremely disappointed with the way his side started after the break.
"A mad 15 minutes at the start of the second-half and the game totally reverses," he said.
"We started the game really well, taking the two-nil lead, but a goal just before half-time gave them momentum which we had to ride out. But they then have a free header from a corner and all of a sudden it's 2-2.
"You expect to come under pressure in games in this League but you have to defend them. It just all went massively wrong for us after half-time.
"After three great performances and wins it's hugely disappointing to lose the last two games the way that we have done, particularly conceding nine goals in them."