8.1.3 Problem

I am starting to have some significant problems with one of my 8.1.3 databases.  I am getting more and more of these errors:
wbd,20552,dholton,2007-01-31 15:32:27.137 EST,45c0fcb4.5048,16,2007-01-31 15:31:48 EST,342126177,UPDATE,ERROR:  could not access status of transaction 253762136
wbd,20552,dholton,2007-01-31 15:32:27.137 EST,45c0fcb4.5048,17,2007-01-31 15:31:48 EST,342126177,UPDATE,DETAIL:  could not open file "pg_clog/00F2": No such file or directory


This is happening more and more, and on seeming random databases.  Any idea what is going on?  I have already dumped and reloaded 2-3 of my databases and now have about 3 more suffering from this.

Right now, I can't upgrade to 8.1.6 until around March (have to wait until the current release of our application is released).  I have 7 databases running 8.1.3 (6 prod and 1 test/dev) and only the test/dev is exhibiting this problem

Any help/ideas on what is going on and how to fix would be appreciated.

Chris