External SSD SpeedDrop after few Seconds with P8Z68-V PRO GEN3

Oct 19, 2018
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Hi, first time poster.

I bought a used PC. All works fine except one thing.

I have a Samsung T5 external SSD from which i also work directly, like, video editing etc. On my laptop everything workds fine, but on my computer I have something like a speeddrop after a few seconds. https://i.imgur.com/krB8DkVl.png

In the explorer it looks like that, it also stays like that. If i copy each file one by one it works.
https://i.imgur.com/jBPzti7l.png

I already updated my usb drivers from the asus site.

Anybody have an idea how i can solve this problem?

Br, shini

PS: My setup
P8Z68-V PRO GEN3
2 x Samsung SSD 840 PRO Series 256 GB in RAID-0 Konfiguration
Kingston 16 GB 2400 MHz
i7-3770 Quadcore 3.40 GHz
ASUS ROG Poseidon GTX 980 Platinum