Hello Ruppro, thanks for joining the Intel Community.
The behavior you are experiencing in these systems is unusual. Have you tried to do a firmware update on the SSDs?
I would recommend you also to try doing a clean installation of the operating system on at least one of them in order to check if there is a problem with the image.
The firmware is up to date, I downloaded the latest SSD toolbox from Intel.
I can take the exact same drive but use a Gigabyte H81TN MB (LG AIO Chassis) and it boots fine every time, so there is not a problem w/ the Drive itself or the image, the issue is w/ the combination of the drive and the DH61AG MB (and possibly the Loop L5 Chassis also) those 3 items are the common thread for the multiple system we have w/ the issue.
Ruppro, please make sure you are connecting the SSD on an Intel SATA port.
Also, try reinstalling the chipset driver.
If you are still having problems and you prefer replacing the motherboard, you can get in touch with our Warranty team Contact Support or submit a web ticket at the following URL Service Request Email.
Using the latest BIOS, Drivers and Firmware for the MB and SSD
I would hope that the Intel MB has Intel SATA ports.
Ruppro, I forgot to mention that some motherboards come with Intel SATA ports only and some others with INTEL and Marvel SATA ports. This is the reason why I suggested you to check if the SSD is connected to an Intel port.
Before replacing the motherboard, would you please try to install BIOS version 106 Intel® Download Center . Please use the recovery method showing on this URL http://www.intel.com/support/motherboards/desktop/sb/CS-023360.htm