Hi James,
I used to have the problem as well but I resolved by making bigger reserve pages which associate with spaces allocation/calculation. Our files are very big specially BASE/DELTA for some systems. Yes, I would run inquire option to see how big of the page that we will need as well.
Also agreed with Ollivier to open the case to support team as needed for assistance.
Please feel free to contact me to discuss specific item further
Jam