Hi there, 

I recently purchased a second SSD to double up the storage on my system from the current 512GB.  I bought a generic SSD (512GB M.2 PCIe NVMe SSD 2230), the same as came with the system, albeit a different brand.

However, when I installed the second drive, without any issues, the system became slow, buggy and games that previously work at 50/60 fps were running at 4fps. The only fix I could find was to completely remove the second SSD.

Any help/advice on a fix would be greatly appreciated.

Thanks 

David