1998 mazda 626 2 L Spark plugs burn out every 4 months on 1998 Mazda 626

this has happened three times now go out to start car tries to start but doesnot continue running change plugs car starts and runs ok. Plugs not fouled or black or oil soked just dead. Tried OEM recommended and platinum they also failed. Any experience in this area.

Asked by for the 1998 Mazda 626