Why does my SC card no longer show up on desktop?

I have iMac.intel 10.8.5 OS. I use 2 sets (A1-A2 and B1-B2) of dual SD cards for 2 videography cameras. A1 and A2 are identical. B1 and B2 are identical. Initally all SD cards showed up on desktop. They erased in Disk Utility when I'd downloaded the data. Then suddenly w/ no changes to computer or software, only 1 card would show up when I inserted it into the SD slot.
If I insert 2nd card, nothing showed up on desktop, in finder or in disk utility. BUT, if I did a Restart, with the 2nd card in the slot, when the computer came back on, behold, there it was. I downloaded the contents, erased it in disk utility.
I need to erase 4 32 Gb SD cards and erase them. I'm currently rebooting 3 times to accomplish this.
It's a HUGE HUGE time sink to do this every time I want to download from cards. What's going on with the rebook solution? and how can I get back to better functioning? Solutions please. Thank you.

It's a longshot, but you could try this:
Resetting your Mac's PRAM and NVRAM

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