Here is the email I just received:
Announcing the Enphase Upgrade Program
We are launching a program for owners of legacy Enphase systems, offering to replace their second-generation microinverters with newer, more reliable technology.
I've been harping on the reliability risks of microinverters for years, and here we are with Enphase admitting their product is so unreliable that they are offering to replace the old ones. I'm sure glad I never sold any of them and are not obligated to be going out to pull up arrays and replace any on-the-roof electronics.....