Does not see 1 memory slot, when copying large files to USB 2.0, the PC freezes hard for 1-2 minutes. What is the problem?

Question

USB flash drives

I have searched dozens of forums, but I have not found even a rough clue what could be the problem or even similar symptoms.
READ PLEASE!)
Everything was approximately discovered at the same time (3-4 months variation, until it became a problem) since almost 2 years have passed.
The computer takes a long time to boot, even after reinstalling Windows - 3-5 minutes. Until you start working, there are almost no background processes - 5-7 pieces (Skype, essential security, Team Viewer and a couple more for a discount) in general eat up ~ 150 MB to the download total, no more. During the inclusion, how much they needed did not look.
Apparently, 1 memory slot broke down, because of which the second one (A2-A1 blue white, do not work) is not functional, I did not notice when this happened, because. There were 3 strips of 2GB. I found out about this when I was tired of periodic brakes - I looked only 4 out of 6GB were displayed - Win was 32 bits (it just wrote 4, not "4 out of 6 available").
I poked, swapped slots, figured out that one slot does not work and it seems that because of this, as I found out, the "neighbor" does not work either - in some slot the PC does not see the bar, in some, if the bar is in it and in others Worth it, it won't load at all. I'm not a professional, so I can say something wrong. In short, I inserted new 4GB sticks into B2-B1 (blue white). And it seems like everything was OK - from 4 GB I raised it to 8 and the problem with memory and brakes disappeared (but not two-channel). But some time later, I began to periodically copy movies to a flash drive from 2GB (usually 4) to 14GB (usually 8). And when copying to a USB flash drive, terrible brakes appear or the computer freezes and the windows do not respond, switching between them does not work, the mouse runs.
100 percent dependency is: the more one file weighs, the more such freezes and the longer they take, the more files are copied in a row (thus increasing the total amount of information that is copied at a time), the more and harder the computer becomes dull, it feels like there a data gap is formed. As soon as everything is copied, the glitches go away. If you take and copy 10-14 gigs to a flash drive (flash drive 16), then they can be copied from 1 hour to 1.5 hours, while the computer is not usable. The file systems of flash drives do not affect - I tried different ones, different flash drives - there are no such computer glitches on another computer - you can work.
If you copy files of 2-4GB in several visits, i.e. copied - I throw another one, then the same amount of information instead of 1.5. hours swings in 30 minutes and the computer does not have time to "react" to it and does not start to freeze - it can only "stupid" a little fast and that's it. If you watch YouTube in both copy modes (at once in a pack or one movie at a time), then video brakes are felt before freezing, and if the computer still freezes, then the video freezes, and the sound continues to go.
Suspicion of Windu ... the assembly may be crooked.
Maybe half of the processor falls off - as I read somewhere on the forums. Maybe the terminals of the processor were oxidized by some kind of makarom - I read the same thing there.
Maybe it's the mother who died a bit and the RAM is not visible and the data exchange makes the system so stupid.
Why am I asking:
1. A suitable mother could no longer be purchased at the time the problem arose - the socket is old.
2. There is a fear that the system may completely shut down and all that, if the voiced problem is not solved in any way, and the complete collapse of the system is a matter of the near future (although 2 years have passed), then in any case you need to buy a new one.
3. There is an opportunity to purchase equipment, or change the computer, and I need to understand the expediency - either to buy equipment or a computer.
4. The computer still copes very well with 80% or more of its tasks, the percentage almost never works at 100, the RAM is not often loaded to the full (video editing, a lot of simultaneously running programs of a graphic nature and it’s a pity to write it off - he’s handsome Can an SSD somehow partially cover this problem?
If all these problems revolve around some part of the mother that fell off and all these three problems are the result of this, then it will be clear to me and suddenly it can be repaired, instead of an expensive purchase of a whole PC.
It seems like he learned everything.
The computer is about 5-6 years old.
Using AIDA 64:
Motherboard - P55M Pro www.asrock.com/mb/Intel/P55M%20Pro/index.ru.asp
Processor - Intel Core i5-750 www.chaynikam.info/Core_i5-750.html
RAM now - Kingston 2x4GB DDR3 - 1600 (800) (10-10-10)
Hard drives don't seem to cause problems - 450 GB and 1 TB.
Power Supply - KT-400EX-12 Comstars 400w
Windows 7 Pro - SP1 64x

Answer 1

Check the memory through memtest (before the system boots, from a flash drive or a built-in utility)
There is a suspicion that the file is checked by the antivirus during copying, hence the brakes. Little RAM is used when copying, not the entire file is transferred to RAM
. The first slot can also be checked - insert one bar only into it and try to run it. It is possible that the problems were due to the 32 bit system.

Answer 2

Check the system hard drive, at least look at SMART. Errors during disk operation just affect the system boot speed and file copying. Depending on the type of errors, it may be necessary to change the hard drive or just the SATA cable.