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Android limited SD speed corrupting pics/vids?

Hi, I've searched and seen many posts on slow sd's, and separately many posts on sd corrupting pics and vids, and I seem to be observing both.

The sd card is a 95mbps Samsung (uhs-1 class 10 u3) , phone is an lg g6. Phone is fine (non rooted), and all apps were working fine. Then when I started pointing apps to the SD, I noticed transfers were extremely slow (I'm only getting between 4-10mbps up and down), and in some cases things were breaking like vids, pics, and offline map downloads failing. See attached.

Ithink what is happening is the os or the SD formatting with a low buffer, is causing the low speeds, and then the apps can't handle the slowness somehow. Like if I take 10 photos quickly and video, the buffer to storage is so slow that it thinks they've failed or something. See attached.

Anyways, would appreciate any help because I feel like I've just wasted 40 dollars on an SD card.

On a side note looked wide and far to find out the G6 sd specs, to no avail other than a forum poster saying their device took the uhs-1 class 10 ok.
 

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And now Spotify struggles to load, presumably because it's trying to read its entire library but the SD read speed is shocking, and it times out or something.
 
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