I've been running Sandisk cards for a long time and have had maybe 2-3 crash up to where they needed to replace them (write-mode gets stuck, or just quits writing, at the worst possible times). They sent me a free FedEx label via email so the whole process was painless, although it took maybe 2 weeks. I've got a newer high-speed one and it froze a third of the way through 8 gigs of AVI which really torqued me. I have a card writer-reader and have been cycling it since but so far so good. Dunno what happened to it?
What I did learn was there are a LOT of counterfeit cards out there not made by Sandisk but have their labels on them. They can often tell by the serial numbers when you need to talk to them if one fails to write or gets stuck. They or someone used to have a site with failed cards and serial numbers, but it has since vanished from the web probably since they could generate another counterfeit one with a good number.
Their newer Extreme III cards has a small orange/red label on the bottom. The Extreme III 8 gigs I have I keep in a nice Pelican case that holds all 8 of them and is waterproof (although I have managed to drop one in water, washed it off under a faucet, and set it aside to dry a few days and it still works!). Older 8 gig ones were all black and silver. Newer ones are slightly faster - so they say. They also come with some postcard so you can download some File Recovery Software that some times works and some times not. Been there. Usually only happens on large AVI movies rather than JPG's, imo. I see the newer Extreme III's 8 gigs are at Costco for like $85 each, and you can find them on Amazon for $45 or about 2 for the price of one Costco card (just make sure you get the newer orange-labeled one).
Also, if you order from Sandisk you can get them to shut up really quick as they will ask you "Where you bought it?" should something go wrong with it and they sound as if they want to dodge you for the counterfeit scheme. If you say, "I bought it direct from you online" they shut up really quick and you'll get a new card pretty quick if you do have your sale's number from them. They've gotten pretty cheap now so I don't buy from them as much as I used to unless I really need a new and large volume odd-sized card.
Biggest thing is to format them in the device you are using them in if you can. Sometimes, certain cameras write a specific header on the card that a card formatted in Windows will not see. The POV.1 VIO cameras write something like POV.1 on every card and sometimes Windows will go nuts with a "." (period) in the card's volume name or sub-folder and report an error.
Oh, some high-capacity cards will not always be seen by your laptop's card reader. My older laptops will only see 2 gigs, and others no more than 4 gigs. The larger Sager NP9280 sees almost anything I throw in it so far, but it's more of Intel i7 8-core mega-workstation than a laptop (it's really too heavy to lug around!). A separate USB reader sometimes helps a lot on a card that Window's won't see.