Bad Lexar CF Card??

[ajh5034]

I have a Canon 5D Mark III and I just purchased a Lexar 128GB 1000x CF Card UDMA 7, formatted it to exFAT and after doing numerous benchmark tests, with GD on and off and in video/picture mode, I get the same low results of 29.9 MB/s write and 13.6 MB/s read. 

Those readings sound completely wrong.  I can only record video in ML for about 2 seconds before it skips frames and shuts off (shooting at 1080/23.97). 

Do I have a bad card?  Am I missing something?

Any help would be greatly appreciated.  Thank you!

[Audionut]

If you have an USB3 card reader, benchmark it with something like this.
If you still get low results, most likely a dodgy card.

Also, it's not polite to double post.