Intermittent issues converting postscript files to PDF with distiller 5.0

Friends,

Recently, I've been having intermittent issues converting postscript files to PDFs. Usually, when it fails, if I try again a few minutes later it's successful so I'm not sure what the issue is. Here are some of the errors when the conversion fails:

%%[ ProductName: Distiller ]%%

%%[ Error: VMerror; OffendingCommand:  ]%%

Stack:

/ProcSet

/CIDParams

-mark-

%%[ Flushing: rest of job (to end-of-file) will be ignored ]%%

%%[ Warning: PostScript error. No PDF file produced. ] %%

%%[ ProductName: Distiller ]%%

%%[ Error: limitcheck; OffendingCommand: showpage ]%%

%%[ Flushing: rest of job (to end-of-file) will be ignored ]%%

%%[ Warning: PostScript error. No PDF file produced. ] %%

%%[ ProductName: Distiller ]%%

%%[ Error: limitcheck; OffendingCommand: showpage ]%%

%%[ Flushing: rest of job (to end-of-file) will be ignored ]%%

%%[ Warning: PostScript error. No PDF file produced. ] %%

%%[ ProductName: Distiller ]%%

%%[ Error: ioerror; OffendingCommand: showpage ]%%

%%[ Flushing: rest of job (to end-of-file) will be ignored ]%%

%%[ Warning: PostScript error. No PDF file produced. ] %%

%%[ ProductName: Distiller ]%%

%%[ Error: ioerror; OffendingCommand: show ]%%

Stack:

(Policy Owner Information)

%%[ Flushing: rest of job (to end-of-file) will be ignored ]%%

%%[ Warning: PostScript error. No PDF file produced. ] %%