If it was only 1 or 2 mistakes, I'd give him more time, like he has been given. But now it's reached 4 or 5 I think dropping him for a spell has to be considered. Smithy is more than capable of taking up the mantle.
If the keeper is suspect it puts lack of confidence in the defense however where was the defense for the third goal, also we need Douglas back, how long will he be out for?