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Without an oscilloscope it’s difficult to say.
All the finished boards have been tested before shipping.
The DRIXO at 5/6 MHz could take several seconds to start since the Q of the crystals are very high.
You could try replacing R24 as I suggested up to 2-2.2k to see if it starts faster.
You could also try powering on the oscillators 1 minute or so before powering the FIFO.
Anyway to get the best performance from the oscillators they shouldn’t never power off.