Lovely, pretty Phal. Are your others kept where the temps can affect spiking? I've noticed that once the spikes start growing, they're more successful in growing stronger with more buds when the temps rise back up. But, I've got plenty of Phals too that didn't spike this year, one reason being because of all the keikis I forced on them with KeikiPro solution last year.
Here is temperate climate and it's not easy to maintain a constant temperature. Now is freezing winter, but very warm inside. But when I have to open the windows for airing... I must shut them back quickly.