Ts-251 Usb Ports Issue

[jfk105]

Hello, on one of my nas (a Ts-251) I've installed an external storage WD to make a local backup to usb drive.
The Usb Drive was attached on one of the rear ports and formatted EXT4 to keep backup versioning.
After some time (about a year) the backup app reports that can't do the job bacause no pair folders... so I checked and I see that no external storage was detected.
After some plug/unplug and restart the nas it worked again. But after some days the problem was back.
So I did some test to solve: 1) Change the usb port 2) Reformatting the Usb 3) Upgrade Backup Sw to Hybrid Backup. Nothing. It works but onlt for a random time.
So the next step was to change the usb drive (now it's a Toshiba) and it worked well for some months (until last week pretty much).
Now after the same tests tried above I've upgraded the nas firmware to latest (4.4.1) and after the reboot (with usb drive plugged) no luck. The usb drive wasn't detected.
After an "unplug/plug" the drive is come back alive and backup is working but I'm thinking that in a few days the problem will recur.
Any ideas? Has anyone had the same problem as me?
Thanks in advance
J

[P3R]

I would suspect the cable.

[jfk105]

@P3R
But when was happened the first time (about one year ago) after many tests I changed the usb drive with a new one (and its cable was a new one) and the issue has recurred (after a while not immediately).
Btw I try to ask if they have a second cable to check...
thanks

[jfk105]

I've tried with a diffrent usb cable on different port: drive not detected. So I guess there's a problem with usb ports (sometimes works after a turn off / turn on but I can't consider it a solution)

[storageman]

If u install Putty and login, try running "lsusb" command to see what this is saying.

[jfk105]

Hello, here:

Bus 001 Device 004: ID 1005:b155 Apacer Technology, Inc.
Bus 001 Device 002: ID 1c05:2074
Bus 001 Device 003: ID 0001:0000 Fry's Electronics
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 020: ID 0480:0900 Toshiba America Info. Systems, Inc.
Bus 002 Device 019: ID 1c05:3074
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub