ive had to replace several of these bulbs in the last year and its kinda getting old

i run hortis in my flower room but was kinda hoping to get a few more months out of these in my veg room, but this keeps happening, to the point where the ballast wont fire the bulb

burnt out stuff on the wire coming out of the bulb, and burnt out stuff inside.

im already ditching whats left and not putting the new free maxlumes in, but still kinda wondering exactly whats happening. it seems like this could be dangerous to somebody not paying attention