USB and SD card both ejected when ejecting only one, message shows one disc not ejected properly

I have a late 2012 iMac running OSX Mavericks. I had a USB memory stick (32gb Sandisk USB3.0) and a Sandisk 32gb Extreme SD mounted at the same time. When I ejected the USB stick both disappeared from finder and a notification showed saying that the SD card was not ejected properly. I'm sure this issue present prior to Mavericks - can anyone shed any light on the cause and what to do to prevent data corruption? Many thanks.

EDIT:
The machine went to the Genius Bar. The Genius replicated the issue, and recommended a left-side IO board replacement. That procedure was performed, and at first appeared to address the issue. SD cards inserted in the store ejected and re-mounted successfully.
The issue has re-emerged, however, so it was clearly not a hardware (only) problem. When I mount the SD card named "Small Test" in the machine after a restart, the machine sees the card and shows the following messages in Console:
18.1.15 17:55:39.000 kernel[0]: hfs: mounted Small Test on device disk4s1
18.1.15 17:55:39.702 mds[34]: (Volume.Normal:2464) volume:0x7fbe16032a00 ********** Bootstrapped Creating a default store:0 SpotLoc:(null) SpotVerLoc:/Volumes/Small Test/.Spotlight-V100/Store-V1 occlude:0 /Volumes/Small Test
That indicated to me that Spotlight was indexing the SD card. I added the card to Spotlight's privacy settings, and the next time I mounted it I got this message in Console:
18.1.15 17:55:52.000 kernel[0]: hfs: mounted Small Test on device disk4s1
18.1.15 17:58:30.000 kernel[0]: hfs: unmount initiated on Small Test on device disk4s1
So that's good. That's what is supposed to happen.
But after a period of time (a short period) after the SD card ejected, when put back into the slot it did not mount. Same behavior as before. This indicates to me that it's NOT a Spotlight problem but rather something else, something that is time-dependent. But I don't know what process that is. Time Machine, perhaps? I added the SD card to Time Machine exclusions as well, but to no avail. Plus, I'd have to do this for EACH SD card I insert, which seems ridiculous.
Clearly something is going on between the OS, the SD hardware, and the SD card. But I'm flummoxed as to what it is.

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