Kernel Problems randomly restarting MacMini Late 2012

I have a MacMini (late 2012) running the latest Yosemite version 10.10.4 and I get ocasional random restarts. Sometimes they occur right after I login from one of these restarts, other times it is stable for quite a while (can be hours or days) and then restarts again. I have unplugged all external peripherals (Firewire HDD and Thunderbolt HDD) but I am still using dual-monitors: one direct HDMI and the other using mini display to HDMI adaptor. The only modifications I made was to replace the original internal HDD which was very slow (5,400 rpm) to a Crucial SSD 512GB and I replaced the RAM to by Crucial 2x8GB DDR3 - 1600 as well which I believe they are both highly recommended and compatible with Mac machines. The SSD model is Crucial_CT512MX100SSD1. Could it be something related to the hardware replacement? The two last kernel errors are here: http://d.pr/n/128a5/b5RQaBL8 and http://d.pr/n/1hF51/3BiwFQ6N I am up to reinstall the whole OSX from scratch if I need to. This was the only way I found to solve a Divx codec issue in the past in a different machine after exhausting all possible Any help on this is highly appreciated. Many thanks to all.