Are the dumps from 15th this month the most recent?
Please move some files from partition I to another partition to increase the free space to at least 10-15%.
Every partition needs at least 10-15% free space so Windows can do its thing in the background.
Less free space could cause BSOD's
You ran memtest, do you mean the built-in feature?
If so, please follow instructions below for running MemTest86+
Run MemTest86+ to analyse your RAM. MemTest86+ - Test RAM - Windows 10 Forums
MemTest86+ needs to be run for at least 8 passes for conclusive results. Set it running before you go to bed and leave it overnight. We're looking for zero errors here. Even a single error will indicate RAM failure.
Please try the following to test your GPU.
- Note the temperatures of your GPU when idle (before doing the test) and under load
Run Furmark to test your GPU. Furmark tutorial
Run Furmark for around 30 minutes
Your GPU temperatures will rise quickly while Furmark is running. Keep a keen eye on them and abort the test if temperatures rise too high