Interesting discovery you made Melburnian1 and insight by Flyerqf:
Most likely low demand period which as speculated for other routes tend to be on Tuesdays.
These flights are not timetabled so therefore not officially "cancelled". Potentially then "off topic"...
QF9 MEL-DXB on Tuesdays 1/11, 8/11, 15/11, 22/11
QF9 DXB-LHR on Wednesday 2/11, 9/11, 16/11, 23/11
Therefore incoming A380 which usually forms QF9 (usually QF10) will sit in MEL for 24 hours
QF10 LHR-DXB on Tuesdays 1/11, 8/11, 15/11, 22/11.
QF10 DXB-MEL on Wednesday 2/11,9/11, 16/11, 23/11
And one A380 incoming into LHR forming QF10 (usually QF1) will sit for 24 hrs before resuming.
Normal operations after 22/11 outbound and 23/11 inbound