Take the following steps and contact CA Support.
1. Collect all dumps produced in the timeframe of the occurrence.
2. Make an IDCAMS REPRO copy of the PROTDMP file.
3. Run an IN25DMPU 'LIST ALL' to check the contents of the file. If the job receives a return code of 0008, then the file is corrupt and needs to be rebuilt.
4. Use the IDCAMS REPRO'd copy from step 2 as input to copy the old dumps to the new PROTDMP file.