Incorrect RAM / missing

I have an old Mac Pro model that was purchased with 26 GB of RAM, this has always been shown as well on the subject this Mac screen. However a few weeks ago I noticed that it showed only 16 concerts as being installed. And more recently he has dropped to only 8. I have not installed any new RAM or even touched. The system works well with no unexpected shutdown lows. I was wondering why the RAM is expected to decrease, and if anyone else had a similar problem.

What model Mac Pro?

https://support.Apple.com/en-us/HT202888

Memory in the 2006-2008 MPs run hot and do not over time. When they fail him disappear as you see.

The MPs ECC (error correction code) memory memory ANDS use errors are usually corrected and which is invisible to the user. When you get too many mistakes, the pair of bars of memory is taken offline. Sometimes, which also cause a kernel panic.

Sometimes reinstall the modules and the memory riser card (2006-2008) can solve the problem. Sometimes it's just a temporary solution

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