Samsung says it is suspending sales of its new smartphone after some of them exploded while they were charging and will let everyone who has one return them.

At least 35 cases have been found of the phone blowing up while it was charging. Those spontaneous explosions are the result of a fault with the battery, Samsung said.

Koh Dong-jin, president of Samsung’s mobile business said Friday that customers who already bought Note 7s will be able to swap them for new smartphones, regardless of the purchasing date.