My two cents worth:
Many, many years ago I had two dud primers, both CCIs, both from the same package. Would not fire despite repeated attempts. Never a problem since.
I used an old Lee hand primer until the "toggle" Scooter mentioned wore out and the primers would barely seat flush, would not seat below flush. Every single primer fired fine in a variety of handguns and rifles.
A light strike is just that--a light hit that makes a less than normal dent on the primer face. That is a firearm issue, not a primer issue. I think too much--based on my experience--is made of high primers and them being seated by the first strike. I haven't seen nor experienced it happening in 40 years of reloading.
My suggestion is next time you get a misfire, check the indentation on the primer and compare it to other cases that did fire and see if it is noticeably different. If so, look for a gun issue, perhaps gunk or brass shavings in the firing pin chamber.
If the indentation is normal, you may have experienced a less sensitive primer. We'd all like 100% reliability in primers, but fact remains that that isn't going to happen.
Or you found the elusive high primer after all!