How do i find out what item is busted (disk or qnap)

Hardware Hub Storage
1

Hi , I have a qnap tr-004 . its set to individual mode and connected to my linux server via the usb cable.
i had 4 seagate disks put in there and i used mdadm to create the raid. its been working fine as a storage expansion for like 4 years now.

However, its kinda busted. the raid has drives that disconnect during usage (writing or reading) and im not sure if its the disks dying or if its qnap thats borked.
[root@mini-nas ~]# cat /proc/mdstat
Personalities : [raid10]
md0 : active raid10 sdk[3] sdj[1]
27344500736 blocks super 1.2 512K chunks 2 near-copies [4/2] [_U_U]
bitmap: 3/204 pages [12KB], 65536KB chunk

A reboot brings back the raid array for a little bit , and i have been slowly copying the files off there .
[root@mini-nas ~]# cat /proc/mdstat
Personalities : [raid10]
md0 : active raid10 sdl[2] sdj[1] sdk[3] sdi[0]
27344500736 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]
bitmap: 0/204 pages [0KB], 65536KB chunk

2

i just double checked and realized the adapter plugged in might not be the right one. swapped it and it seems to be working. so i guess it was qnap but not cause it was dying but because usage would require more power than what was being used.

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