One of the systems to fail was a firewall running off SSD.
SSD or CF?
It would appear it's also possible to damage some flash memory by powering off at the wrong moment? I had a router running on a nearly new SLC flash card and it kept suffering errors every 24 hours and perhaps it was filesystem corruption since it was kind of fixed when I rebooted. Then after a few more days it died completely, briefly I could repartition it and then an hour later I could no longer even get it detected to the OS and hence it appeared absolutely completely dead.
So that's a new 4GB SLC card, using around 500MB of it and a light writeable filesystem running pfsense (perhaps a few writes per minute) and it died inside a month... I don't have enough data to see if it died from wear or if I was just unlucky...
This is a cheap (ish) CF card though, not an SSD drive
Ed W