There is always an element of risk in Dubai luggage transfers. I have had a BKK-DXB-BHX suitcase go via Entebbe and arrive four days after I did. With most of the Emirates flights parked off stand and if your transit time is less than 2 hours the risk of your luggage not being on the same flight increases.
Last time I did BKK-DXB-BHX the captain delayed departure from DBX for over one hour - waiting for luggage to be loaded. I was happy to see my own suitcase being one of the last to be loaded - thanks for waiting Captain!!
Long experience has taught me not to keep ANYTHING valuable in the checked in luggage - and a change of clothes in the hand baggage.