RAM crashing but then not crashing after training reset?

[TrantaLocked]

This is an interesting situation for which I haven't understood completely yet. A while ago I was doing some troubleshooting on my USB 3.0 bay module and this required me to restart the computer and power off the PSU multiple times. I'm not sure if it was the 3rd front panel device or the port itself but I eventually gave up and completely disconnected the cable. After I failed with that (I hate USB 3.0 20-pin design) and got back to using my computer, I noticed I was getting BSODs too often. I didn't change any settings in Windows or BIOS that would have caused this.

 

I used the Windows memory diagnostic and was getting a few errors, which was scary because I've passed that test before with the same BIOS settings. I had an older version of memtest86 at the time which wasn't giving me errors but I've now upgraded to the newest version with Hammer test that is very good at detecting issues. So I went into the BIOS and tried some things including changing RAM voltage, timings and speed, but eventually I realized I could no longer even POST with the settings I'd been using for nearly a year on this PC. I'm still trying to figure out if this is a connected USB device issue or something else but it doesn't make a lot of sense to me. So at this point, I can no longer use CAS 1 anymore or else I can't POST.

 

I went through a lot of trial and error and eventually I came back to my original RAM timings but with CAS 2 instead of CAS 1. It was very strange because for a while these settings were were giving me errors in memtest86 Hammer test, but all of a sudden after a process of elimination coming to no verdict, those same settings are no longer giving me errors in both memtest86 and Windows memory diagnostic. I thought that maybe when I was doing the USB 3.0 front bay thing, my BIOS was trying different training timings thinking bad settings were the reason it was restarting and fucked my setup, and may still be fucked seeing that I can't even POST at CAS 1, but it must have semi-unfucked itself to allow me to pass error-free with most of my original settings. It all just seems wild and I don't know what really happened. I really don't think it's voltage related as I've tried voltages and it isn't helping and if anything going up or down just makes it worse. The kit is G.Skill TridentX  2x8 GB DDR3 2400 running at 2133, CAS 2, 9-11-11-31-220, 1.52v. It used to be able to run the same but at CAS 1.

 

Edit: For anyone wondering I've been stable since I made this post.