Kris Lindsay admitted he is considering his future as Dungannon Swifts boss after an "embarrassing" second-half collapse against Ballymena United.
His side let a 1-0 half-time lead slip as the Sky Blues ran riot at Stangmore Park.
The Swifts have now leaked three or more goals in four of their last five games, leaving Lindsay deeply frustrated.
And after another miserable result, he said he will look at his own position over the weekend.
"Disappointed is not the right word - embarrassed is the right word," Lindsay said.
He added: "I am (considering my position), yeah. That is unacceptable.
"If it was a one-off, maybe you put it in the bin, but it's not - it is time after time after time and I've got to look at things.
"Am I not getting enough, am I not giving the right instructions? It's certainly looking like that at the minute. We didn't compete, we didn't show any desire, didn't make tackles, didn't make headers, didn't defend crosses, didn't look a threat going forward.
"It is time after time after time and maybe I've got to look at myself.
"Are the players just not doing it for me? I've a lot of thinking to do over the weekend because that was embarrassing."
Dungannon went ahead from the penalty spot in the 21st minute. Rhyss Campbell was fouled by Josh Kelly and Michael Carvill swept home the kick.
Jude Winchester drew United level with a 54th-minute header after being left free in the box and, soon afterwards, Ross Redman delivered a terrific ball to the back post, where Trai Hume nodded in.
And the comeback was stepped up from the spot in the 60th minute. Goalkeeper Sam Johnston was ruled to have tripped Shay McCartan and ex-Swifts striker Paul McElroy slotted home the penalty.
McElroy then turned provider for the visitors' fourth, supplying a terrific cross for McCartan to sweep in, and the former Northern Ireland international rounded off the scoring in the 85th minute.
Boss David Jeffrey said: "It is pleasing because it was against Dungannon - a team I rate highly. I would never, ever have seen that result. If we had won by the odd goal, I would have been well pleased."