Oracle Database 11.2.0.1.0 CPU hit 100% on Windows 2008 R2 64 bit Hyper-V

Oracle Environment Detail:
Oracle Database Enterprise Edition :11.2.0.1.0 (NON RAC, No failsafe)
O/S:     Windows 2008 R2 64 bit (6.1)
Specifics: Virtual Server using Hyper-V
Memory: 9 GB RAM
Processor: E5540
Specific about the issue:
I have two database instance created on this server with ‘memory_target=3600M’ each.
I am getting into an issue where I find NO activity on database except regular schedule job running using DBMS_SCHEDULER –
•     Database FULL export DAILY schedule time 7 & 7:30 PM accordingly for both instance (takes about 15-20 mins each)
•     Database FULL RMAN DAILY schedule time 9 & 10 PM accordingly for both instance (takes about 35-40 mins each)
This was set up on Feb 25th 2011. Since then we have encounter CPU hit 100% TWICE in this system at around 8:30 PM (SAME TIME). Both database instance exports keep running and never finish. While RMAN schedule job has NO problem. Mostly everything runs every smoothly without any issue.
Replicate the issue:
I am unable to replicate this issue and do not know the cause of the issue.
Work Around:
Oracle services shutdown/Server reboot.
Would anyone know about this issue? Have any information could help? This system will become production soon and want to make sure we have solution for this.
Thanks in advance!

I am finding that CPU hit 100% is very specific to Oracle 11.2.0.1.0 Export Utility (exp) used to take FULL database export. I understand Original Export is desupported from general use as of 11g but available for specific need.
Have anyone faced this issue with 11.2.0.1.0 Export Utility (exp)? Please help.
I have a need to use export utility which gives us migration options.
Thanks!

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