well, i do not repot unless it had really outgrown the pot OR the see issue with the roots (eg. roots overcrowding or infection). i do not face problem like media breakdown much because i used mainly charcoal as planting media. as long as you do not disturb the roots too much while repotting, should not be an issue. but repotting 4 times a year is definitely a big NO for my catasetums.
catasetums are only repotted every 2-3 years for adult division and more frequent for younger plants.