USB Drives Ejecting Themselves randomly

I did get documentation stating that the logic board was changed, along with an order form for a new logic board from the techs. However, a friend of mine who worked for Apple support told me that the serial number of the MacBook should have a line through it (ie crossed out) when looking at it in System Information if the logic board was really changed, so I do have my doubts, since mine is not crossed out. But then again, it's a pretty major store and an Authorised Apple Service Provider, I don't see why they should cheat their customers I such a way. I don't think they would...

So, just got my MacBook back from second repair. They said the Apple Tech did a software update and after having performed the following tests, found no fault what-so-ever with my hardware (specifically the USB ports):

Apple Hardware Test

Apple Service Diagnostic

Mac Resource Inspector

So I took it to McDonalds next to the shop, plugged in my USB stick, touched it slightly and of course - it ejected! Then I tried it in a few more times and the eject did not re-occur. Same exact problem as before.

Now I really don't know what to do... I can't come back to the shop and argue that the Apple tech is wrong, because I can't re-create the problem there, as it is so intermittent. I am leaning closer and closer to conlculding that it really is some design fault with the MacBook Pro which can not be remedied.

Any suggestions of where I should go next?

Thanks for support in advance!

Hello again... My case has progressed considerably since my last posting, but unfortunately there is still no resolution in sight. I would like to share my experience and perhaps get some expert opinion on how I should proceed.

The USB ejecting problem persists, just as before, and just as intermittently. The device has now been sent for service 3 times, and I have spent several hours on the phone with Apple Support discussing this issue. The first time the machine was sent for repair, the logic board was changed - the problem persisted. The second time it was sent, I was told that there is nothing wrong with it. After that I decided to contact Apple Support. After extensive troubleshooting and sending them videos of my issue, and exchanging several emails, I was told that all we did was establish that this is not a software problem and that the device must be sent back to the service provider. So I sent it for the 3rd time, only to get an email from the Service Provider, stating that they are not able to recreate my issue under any circumstances and after several attempts, and that there is nothing wrong with the machine. I told them to send it back to me and that I will pursue legal options. After I got an email from the store to say that I can pick it up, I went in and they were not able to find it for half an hour. After it was finally found, I was able to recreate the issue successfully and show it to the sales representatives, who confirmed that there is an issue but they cannot do anything until their resident Apple tech has a look at it. I came in the next morning, showed it to the Apple tech and was again not able to recreate the problem, so back to square 1 - I was just told there is nothing wrong with it. Since the 3rd repair attempt, I have been waiting for a call back from Apple Support in hope of further assistance.

Just to re-cap, my problem is that all of my USB devices get ejected and re-connected immediately when the USB cable is touched slightly while connected to the MacBook Pro. This issue is intermittent, and some days it works perfectly, and some days it ejects with the slightest touch.

Please let me know if anyone has any ideas of what I could do?

Thanks in advance...

<Edited By Host>

Today I discovered that something similar is happening to my girlfriend's Samsung netbook, when I wiggle the USB connection of an externally powered HDD, it unmounts, and re-mounts immediately, just like on my MacBook. It hasn't yet happened to the pen drives on the Samsung, like it does on my MacBook, but this could be a clue that perhaps this is normal behavious for USB connections!? I does seem to happen more often on the Mac than on the Windows netbook, and before I got the Mac I never really paid much attention to it on Windows machines, but I do re-call it happening, where the drive would just eject if the connection is touched.

Pls guys let me know your thoughts on this...

Hi Guys,

Just to give some closure to this one... The problem is finally resolved by getting a new MacBook. The old one remains mysteriously faulty.

Thanks all for your help!