I think my Ice cream might be getting there based on your observations. The last full leaf has a pinkish mid rib that none of the others do and the"cigar" leaf(also full sized) on top's back of mid rib looks to be even redder. The pics didn't come out due to the sun. The other clue is that the base is extremely swollen and has started to split from the corm about 2 1/2 ft up.
Could this be a sign of impending flower? It would just figure it comes at the end of August!