Samsung has postponed media events for its Galaxy Fold planned for this week in Hong Kong and Shanghai, days after reviewers of the foldable handset reported defective samples.

The phone was scheduled to launch on April 26 in the United States, but technology journalists have reported breaks, bulges and blinking screens after using their samples for as little as a day.

Samsung said it received “a few” reports of damage to the displays of samples of the $1,980 handset, raising the specter of the combustible Galaxy Note 7 three years ago which the firm ultimately pulled from shelves at massive cost.

Samsung says it is thoroughly investigating the damage reports, but declined to comment on whether there would be any change to the U.S. release date.

The firm plans to begin South Korean and European sales in May, and Chinese sales from an undisclosed date.

Chinese rival Huawei Technologies Co Ltd has also announced a folding handset, the Mate X.