I bought 2 brand new, different SDXC cards (both 128GB, one Extreme Pro, one Ultra) from SanDisk this week from separate suppliers, both of which were faulty and unusable. Their online support chat was utterly useless. It counted down your number in the queue, and then when it got to "your turn" it was just silent. Ended up phoning their support line who could not work out why this was happening. These used to be my go-to company for SD cards in the past, but the decline in quality is so appallingly apparent.
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