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Do I need to replace my SSD?

I have a mid-2012 Macbook Air that has been suffering from a range of issues over the past few months. It freezes and shuts down randomly. It also sometimes shows the flashing question-mark folder upon startup. It also often runs extremely slow even when first turned on (it should be fast as it has 8gb of ram). I have been trying to figure out what the problem is, and I think it may be the SSD for the following reasons:

• I tried erasing the internal SSD from disk utility and installing and running MacOS on an external hard drive. Everything works perfectly on the computer while running MacOS from the external drive (it was on for 24+ hours without shutting down/freezing and without slowness issues).
• While I was using MacOS from the external drive (it had been on for a few hours), the following message suddenly popped up in the top right corner:
  • It seemed strange to me that the internal SSD would "eject" randomly while I was using the computer.
• Many of the times I've tried to run the Apple Hardware Tests (by holding down D during startup) the computer randomly shuts down before I'm able to complete the test. Sometimes it even shuts down before I am able to begin the test (while inputting the WI-Fi network details).

I tried opening up the back of the computer and removing the SSD, cleaning the area with compressed air, and then reinserting the SSD, however the problems/issues persist. Do you think I need to replace the SSD? Maybe the issue is the SATA cable that connects to the SSD? Do you think I should replace that?

最後更新：2017-09-15 12:06:39

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