Cattleya has gone from great to grievous

[Bethy]

After repotting a new cattleya with a good potting mix (orchiata), it has started losing leaves, and the pseudobulbs are dying and shriveling. The temperature is warm in the summer - upper 70s, low 80s. The other catts, growing in the same indoor space, seem to be doing okay. My gut tells me the orchid is underwatered, with the high temperature and fresh potting mix. What do you think?