[Galaxy Note 4 Q&A, Help & Troubleshooting] d4rkkn16ht:
There is no doubt that there are some product defects are out there from any manufacturer including Sandisk & Samsung.

In statistical science there will be around 0.5% -5% margin of errors in any mass productions.

So if Samsung/Sandisk produce 10 millions of products there are around 50,000 - 500,000 defects.

Of course they will try to reduce the margin of errors as low as possible by Quality Control.

The thing is QC is only taking random samples, therefore the possibilities of defect out in the market is still there.

Thus either Sandisk/Samsung will have "a few" defects in their products.

By this, I clearly stating that I'm not saying that Sandisk is bad & Samsung is better.

It's just some of Sandisk product batch in "large size (64 GB & up...+ probably 32GB too) microSD" is bad.

And from my knowledge, Apple iPhone 6+ 128GB is also suffering a problem with their SSD chip, so it's not only Sandisk & Samsung.

And remember that XDHC SSD tech in microSD is relatively new tech, thus glitches is expected.

"Many" is relative, 100 complain is plenty if the the total products is 110.

10,000 is a few if the total products is 5,000,000 as it less than 1% & usually manufacturer "ignoring" this case as it's only a minor case.

They will focus more on creating a new & better product than fixing the "insignificant" defect.

The best thing a buyer like you & I can do is: claiming warranty & get a non-defect one (or another device).

Another question for you: is it working for opening files & deleting/creating files or only for opening files?

My failing 64GB Sandisk is still accessible but only for opening file.

If it is working for both opening & deleting files/folders then most likely the Note 4 product batch in your area store's is bad (in the 2% - 10% margin).

Look at point 1.

Look at point 1.

This question is OOT (Out Of Topic), but I'll give you an answer anyway.

SSD is not HDD.

In SSD tech. there is no moving parts = only Chip(s)

In HDD tech. there is moving parts = Disc platter + reading head.

SSD & HDD have a different lifespan.

SSD has a limited write cycle & HDD will wear out it's motor (for moving the Disc platter+reading head) over time.

BSoD/Blue Screen of Death in Ms Windows environment is caused by Hardware/Device driver malfunctions & not because doing multitasking.

The malfunction causes are varies widely from defect product(s) to end of lifespan.

The speed of SSD tech. is also varies depending on what tech. is use on the chip (YES SSD technologies is also varies).

Samsung is using OneNAND tech. & Sandisk is using mDOC tech. but not limited to only those 2 tech.

Android is basically a Linux OS & in Linux, running apps in RAM is the best practice.

So, it's likely that Android will try "pushing" running apps into RAM no matter where it's origin (either internal memory & microSD)

It only accessing Internal Memory/microSD if "needed".

I don't know how old are you or what is your knowledge background, but my best suggestion is try another microSD that uses different SSD tech. from Sandisk such as Samsung (or others).

Another suggestion is returning your Note 4 & try to buy from another Store in another area, because the nature of manufacturing that produce mass products in batch & distribute it also in batch thus if the batch is mostly a defect batch then it's highly chances most other unit is another defect one.

Hoping for a solution from the manufacturer for a problem is a way, but it's better doing something than waiting :)

By this I will not reply to this thread anymore, consider it CLOSED (no offense ;)) & GOOD LUCK :good: