QSC is committed to the delivery of best in class products and services. To ensure continued innovation, QSC may periodically elect to discontinue specific parts or products. Once obsolete, all bug fixes cease and support is limited to best effort, such as service, repair and clarifications of previously published material.
 

List of products that have limited service or no longer serviceable
https://www.qsc.com/support/product-repair/rma-form/end-of-life-products/