Mac Mini RAM upgrade: failure after one week

my system:
  Model Name:          Mac mini
  Model Identifier:          Macmini5,2
  Processor Name:          Intel Core i5
  Processor Speed:          2.5 GHz
  Number of Processors:          1
  Total Number of Cores:          2
  L2 Cache (per Core):          256 KB
  L3 Cache:          3 MB
  Memory:          4 GB
After severe performance problems with Aperture, I decided to go for an RAM upgrade to 2x4GB. Went to my (non-Apple) dealer, got me two DDR3 1333Mhz Samsung bricks and put them in. Worked like a chime. Startup went fine, RAM types shown in the Activity Monitor with plenty of free RAM and great performance... for a change.
After a week however my Mac froze. A restart gave me two beeps and a flashing light in front. Manual tells me 'wrong RAM type'. Same situation after replacing only one of the bricks.
A bit weird after a week of juicy operation?
Getting back the old RAM installed resulted in a working Mac - but with the limited memory obviously.
Will go back to the dealer and have the RAM replaced next week.
Ever heard about RAM failing after a well?
/thanks!

UPDATE:
right, I went back to my dealer and got the RAM sticks replaced. the miniMac booted up at the store and is now working fine again. Let's see for how long.
Size:          4 GB
  Type:          DDR3
  Speed:          1333 MHz
  Status:          OK
  Manufacturer:          0x80CE
  Part Number:          0x4D34373142353237334348302D4348392020
  Serial Number:          0x005001B9
I had checked the serial number and RAM chip IDs with the Samsung tool from their homepage. Looked just fine.
To my limited knowledge about Silicon production it would not be too easy to produce fake RAM sticks that
- are accepted by the HW check
- show the capacity as specified
- .. but fail after few days (haha!)
I will update you about the latest with this story.

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