There are a couple of papers...
Acta Cryst. (2010). F66, 346-351
Crystallization and X-ray diffraction studies of cellobiose phosphorylase from Cellulomonas uda
The space group was originally P21. During collection the crystal moved out of the beam (and possibly the cyrostream). Upon recentering, the space group was found to be P212121
Acta Cryst. (1998). D54, 448-450
Crystallization and preliminary X-ray analysis of thiaminase I from Bacillus thiaminolyticus: space group change upon freezing of crystals
At room temperature the space group was P212121 but upon freezing the space group changes to P21212
Hope this helps.
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