The ORA-12570 error is telling you that data is expected to be received, but that data was not received. The cause could be a network hiccup. Check with your network administrators to see if they are noticing any network failures or other problems. If you could let them know the time this error occurred and the systems involved, they may be able to narrow down the problem even more.
A cold backup means that the database is shut down and unavailable. If a transaction is using a link to the database when it is shut down for the cold backup, then the transaction will receive an error. Typically the "ORA-3114: not connected to ORACLE" message is given, but you may also receive the ORA-3113 error.
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