I had a similar problem lately. I have not done static for few months and was preparing for a competition (my first one). Before I was doing just under 5 minutes. A week before the competition we were practising static, I managed just under 4 minutes. Next day I made 3 minutes. The day after I only managed to do 2:30. One day rest and the next try finished on 1:30
No contractions yet, but I just could not find the motivation to keep my head down...
On competition day I had the bail out thoughts come at least twice during my static, but than I just said to myself, hey, come on everybody is looking, it would be a shame to just come out now and you know you can do more. So I managed to do 4:31, which is well short of my PB but still better than my training results.
So for me it was all about motivation and answering the silly question which usually comes up during static - why do you do this, when you can just raise your head and breathe?
