Bummed out

[burz]

I'm pretty sure I have an aganisia cyanea(label said acacallis cyanea X self). I got it over the winter and it was doing the best out of all my orchids. New growth, roots, and plumping pseudo bulbs. Now all the sudden all leaves on the second youngest bulb turned yellow and brown. The temps have gotten higher but none of my other plants around it have shown any sign of heat stress and Ive changed nothing as far as watering/fertilizer goes. I cut the leaves off thinking they weren't capable of doing there job and now one of the older P bulb's leaves are doing the same thing. But the new growth dosent seem to be effected. I'm thinking it looks like too much heat/sun or over watering even though I havent changed watering routine.Any help would be great, thank you