A statewide error in the NSW Electoral Commission's system has resulted in intermittent outages at pre-polling stations.
A Commission spokesman said they had "detected a performance issue with its electronic roll mark-off system".
"This has resulted in intermittent outages of that system at early voting centres," he said.
Despite the issue, no voting centres were closed.
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The spokesman said the issue was being examined and was expected to be resolved shortly.
"There are backup arrangements in each early voting centre to allow voters to have their names marked off the roll," he said.
"Activating those arrangements may result in a delay for some electors in casting their vote."
On Tuesday, the Commission said they were aware of an issue relating to its iVote internet and telephone voting system.