Quoted from Jared:
Yes, of course it's true. The tech line started getting many calls after kiss started arriving in homes. People who were installing third-party shaker motors into their kiss machine were finding in some cases that their machine was locking up and becoming unplayable.
The source of the issue was traced to the third-party shaker and the way it handles electrical current.
This happend so frequently and so quickly that a service bulletin which issued to prevent further damage to machines globally.
The bulletin only applies to spike machines. As of the timing of this bulletin only a few third-party vendors are offering spike shaker options. I will not name them specifically.
Stern will have an official factory authorized spike shaker motor available for purchase from any authorized retailer or direct as an accessory from the store and shop online very soon. Estimated 2 to 4 weeks. This motor will be covered completely under the Stern warranty unlike third-party shaker motors.
Yes, but there's more to this. Factory shakers from older pre-Spike games also have this capacitor. So it's more of a design shift from Stern than a reliability or durability issue.