I have a problem with Bulbophyllum Rothschildianum

[King_of_orchid_growing:)]

Bulbos are usually pretty strong, (there are a few exceptions, but most will not decline if you repot or remount regardless of the time of year). Repot now if you feel there's something wrong.

[Queenslander]

Thanks Dave and Phillip, I will repot. The temp. here in Brisbane is around 26 C, which is the highest record ever for this time of the year, it is our Autumn here, Winter will be here next week. So repotting shouldn't be too much of a shock.