0x00000019 0x0000000000000021 when using readyboost

I use readyboost on my pc because it improves the speed of some the games I play (Battlefield 4, in particular). I have been using a 16 Gb. USB Flash drive since 2010 without any problem. But I recently added a 32 Gb. XD (SD) card to use for readyboost. I can access the card fine, and chkdsk says there are no errors, but since I have started using the card, I keep getting random 0x19 BSOD stop errors. the parameter is 0x21. I do not know what to do next or why readyboost is causing this error. it goes away when I stop using the 32Gb card. the full error is:

The computer has rebooted from a bugcheck.  The bugcheck was: 0x00000019 (0x0000000000000021, 0xfffffa8010f19000, 0x0000000000001030, 0xb03c3740a81a7de7). A dump was saved in: C:\windows\Minidump\081814-32292-01.dmp. Report Id: 081814-32292-01.

I suspect readyboost is the cause of the issue, because the only difference in conditions between when it does and it does not happen is, is the use of the 32Gb card. I know that there is a 32Gb limit to the size of the memory card I can use. but using the max size should not be causing any issues