I've tested all of them (literally), on 3 very different phones (GS5, LG3, Moto X) , and never experienced this.
Without any more data on the test environment, one might think they would stop to check whether the problem is on their side if it happens all the time on every device.
It's like saying "Every table we tried had objects roll off them. Therefore, they are bad tables" (or you know, the floor you put them on wasn't level)