New to forum. Have a PA 32-300 that went into annual in March. Had a few issues with brief engine stumbles that turned out to be a faulty mag issue with the dual mag.Overhauled but had a complete right mag failure after 1 hour of use.This was replaced with a separate dual mag unit but had another right mag failure after 3 hours of flight. Mechanics seem to be stumped why these recurring mag failures. Any one else experience this issue or have any helpful insights?