The Pittsburgh Steelers experienced issues with their headsets during the first quarter of Thursday night's game against the New England Patriots, when audio from the Patriots' radio broadcast was being relayed to the Steelers coaches.
The NFL has since issued a statement from spokesman Michael Signora (via Sports Illustrated's Greg A. Bedard):
In the first quarter of tonight's game, the Pittsburgh coaches experienced interference in their headsets caused by a stadium power infrastructure issue, which was exacerbated by the inclement weather. The coaches' communications equipment, including the headsets, is provided by the NFL for both clubs use on game day.