Early Leaf Drop in Cymbidums

[StevenU]

Brought my large Cymbidium inside 2 months ago and it started dropping leaves. I've had it for 7 years and I'm used to a leaf or two dropping every month. The leaf drop is accelerating from one or two a week to 5 or 6.

In the past only totally brown leaves would pull off easily, those not quite dead would need to be cut. Since this has started even mostly green leaves with a bit of yellowing drop by themselves.

Noticed today that when I picked up 8 leaves, many were yellowing at the base and the rest of the leaf was pure green. No spotting on the leaves. No Cym or ORSV virus I tested.

Wondering if this is some fungus or bacteria issue?

My cultural practices have not changed from the past and the plant is huge and healthy. It just finishing up blooming on 14 spikes. There were a few bud blasts maybe 1 or 2 on each spike (thought it was the cats at first but that's ruled out). The leaf drop seems to be mostly on this summer's new growths.