I don't exactly know why the ram in your mac pro is dying, but keep in mind that most memory manufacturers have a 'Limited Lifetime warranty.' So as long as you have a receipt, send it back under RMA and get a new stick. Dj vu (free version download for mac.

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It is not uncommon for RAM to fail. However, your failure rate does seem to be a bit abnormal. I don't have much experience repairing Mac Pros, but there should be a memory utility you can use to test your RAM. There is memtest86 available in linux distros and that probably also works for Macs. What are you running on your system gaming, photo or video editing? Heavy processing can push the system as a whole hard. RAM can be pushed to failure from heat.

Fb-dimm

Anyone Using Csx 4gb Ram 800mhz Fb-dimm For Mac

I've had to replace a few of our Mac Pro's memory a few times (we have two of the older towers). The newer 2013 models seem to have less of a problem. I would recommend making sure the system is dusted out making sure the fans & heat sink fins are clean. You may want to get a good thermal monitoring app like so you can watch whats happening in your system.