Come to me flies and crawling bugs. This plant wants to give you great big hugs
Aren't I pretty, don't I smell good? I'd come to you if I could
But I can't so you must come to me, I'm sure we will get along splendidly
If your sure its root rot that is the problem you can always switch to net pots, more airflow into the medium with help some. Although if you just repotted, adding some slits into the new pot would accomplish the same goal. Switching to 4" net pots and adding 1/4-1/2" lava rock into the mix fixed the bark/sphagnum decay issues I was having a few years back. The bark is still decaying but I'm getting another year out of the mix with this combo.
I know in the US they are getting a lot of there orchid/hobby tree bark from tree farms designed just for harvesting the bark, might be a reason for the new bark breaking down faster than the older bark. They are using a specific species of tree with the only purpose of selling the bark.