catt's leaves yellowing

[Carl]

Hello Everyone,
I have a new catt that I purchased from a grower in FLA a few weeks ago. I live in VA and the catt was doing well until this week. The pseudobulbs are somewhat shriveled and two of the leaves on older pseudobulbs are yellowing. I began watered the catt once a week and the pseudobulbs still did not plump up compared to my other catts. The grower said that they water theirs about 3x a week. So I started watering 2x a week as it is cooler here in VA than FLA. It have white, plump roots all over the top of the mix and is currently in flower. What could be causing the yellowing leaves? I am reluctant to repot as it is really in flower--8 all together. What should I do? Help!