X1D not recognizing memory cards upon startup

[Muusman]

I have had my camera for about 2 months.  All of a sudden about half the time I start it up it is not recognizing either memory card (when there are two properly installed in the two slots).  Generally by restarting the camera once or twice solves the problem, but you can miss a lot of important shots that way.  Anyone else having this problem?

[BradP]

Only had mine three weeks and haven't had this bug yet, though today on one startup I did get that message flash on the screen for a second then it went away.  I used to get a related error message saying that the write speed of the card was too slow despite it being 90 MB/s.   Others I have seen have had that same error message flash.  That appears to be solved for the moment by inserting a new CF card that operates at 160 MB/s.

[rent]

I have been using 2x SanDisk 128GB Extreme PRO UHS-I (V30) cards in the X1D with no problem whatsoever.

Alex

[howsol]

I had this problem but found it when away when I reformatted the cards.