Got to be some problem!
Your DB is complaining that it cannot write! There should be some OS/issue flags.
It must be able to write to the control file. Each and every copy of the control file indicated in the pfile/spfile.
Can you do an ls -l on the file? What are the permissions? Are these being changed?
Who owns the file?
Are there any other files in the same directory? Do you get any other write errors, in the alert log?
Here is an idea:
Copy control01.ctl (I'm guessing you have 3 ctl files) to control04.ctl
Leave control03.ctl alone. (don't delete rename)
Modify your pfile/spfile to utilize control04.ctl instead of 03.
We use RMAN for backup (hot backup), However I find out today that we use TSM software to backup UNIX server. It does backup of Oracle home directory which is on /u01/app.. Could this caused this errors? Should I stop this back up job?