DP 6.11 RDS taking over 100% CPU

Hello I am running DP 6.11 on HP-UX 11i and I noticed that after a while the backups are slowing tremendously when I issued the command top I noticed that RDS is using over 100% of CPU. 

 

CPU TTY PID USERNAME PRI NI SIZE RES STATE TIME %WCPU %CPU COMMAND
1 ? 5140 root 152 20 80928K 42308K run 198:19 100.17 100.00 rds

 

When I restart the RDS process the backups run smoothly for couple of hours and then RDS gets high again and all backups slows up.