So only when software arrives as a final version, bug free, with every possible eventuality coded .....
Snooze-button glitch delayed Rosetta's wake-up - space - 21 January 2014 - New Scientist
From the piece:
"Yes, we will have to fix it but this doesn't affect anything we are doing now. It is past history," he says.
The ESA team already has a number of hypotheses for why the unplanned reboots took place. They say they are now working to determine the true reason and the solution.
"They" being Human Beings....