Total failure after only 7 months - "card is corrupted"

Normally I've made good experiences with Sandisk - if one of a bad buy a very slow USB 2.0 disregards sticks with 64GB. Both worked in many of my cameras as well as two mobile phones and a tablet so far Sandisk Micro SD cards fairly reliable. Not so this 64GB Sandisk Ultra - after only 7 months of use (only in a Samsung Note 3 Neo, then in a Samsung Note 4) it failed yesterday suddenly their service. "Card is damaged" told me the phone with - even though I had changed this card only once from one to another phone and I have been doing well behaved first "disabled" card.
Now many photos are lost, because in attempting a restore, I only managed to save a part - unfortunately, exactly the (older) pictures, which I had already made a backup. Very disappointing ...

PS: That also "lost" an acquaintance recently completed a 32 GB card has the same type in the sense of failure makes me now more than thoughtful.