Clearcase unexpected behaviour explanation

[birdie]

Hi,

I handle release engineering of a product whose source code is located at clearcase server which is a Solaris machine. I have installed clearcase client on my Windows machine. I have created static snapshot which I update everyday to get the files from the server. I have automated the whole process of , first, update the view, and then, build the product.
I am using this since last 3-4 months. Recently one of our build broke. There were no checkins done regarding that break.
We could not find the reason for this break and the whole day went. Next day the correct build came at its time and there was no break.
When I observed the updated log of clearcase client, I found that on former day some of the files are deleted from their expected folder "abc" and new files from some other folder "xyz"( folders abc and xyz are at same hierarchy) are copied to "abc". Then I observed latter day's log. I found that the files which are copied from xyz folder to abc are now deleted and the correct files which were missing from abc folder are now added as new files.

We discussed this problem in our whole team but nobody could answer anything. The history of the files that are getting deleted/added in abc folder showed the last checkin time of 5-6months back. So we are totally dumbstruck by this issue. We dont know how to restrict this problem from happening again...