facebook is really unpredictable. I’d leave it 24hours and inform the client if things continue. it may be due to other reasons outside of facebooks algorithm. maybe things going on globally or seasonal times of the year ect. but i’d find that hard to be the case with a large spending budget.

I tend to find the campaign will make catch-up for poor performance at the end of the week as well. as many facebook users are on from wednesday – sunday.