perldoc -f each

When the hash is entirely read, a null array is returned in list context (which when assigned produces a false (0) value), ...

This leads me to believe that one of these could cause the problem:

• You are exiting the "while ..(..each)" loop early, whthout exhausting the hash. The next time you return, it would pick up where it left off for that particular hash (If I understand the docs right).
• You have another "each" working on the same hash elsewhere in the code, which exits early.

To "reset" the while (I would never do that in production code, before finding what causes the problem), simply do an throw-away keys() or (values) fetch prior to the "each".

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