Smart IP65 Charger 15A/12V not charging, switching between bulk and abs, after firmware update

Hi There,

I have three of these 12V 15A chargers

Coincidentally after the recent firmware updates all three are now no longer charging and flipping between bulk and absorption.

Do I have to make a claim for all three?

I’ve previously had one of three go bad I think due to heat. I now run a fan over them when in 15A mode. The one of three I had replaced under warranty.

Are we sure the firmware isn’t related to this? Three chargers all from different dates fail all at once ?