MacBook Pro not seeing hard drive?

Question

Solid State Drives

Hey people. We have a macbook pro 13 2012 (A1278) on a Kingston ssd. A couple of days ago it hung, after a forced reboot I see a flashing folder with a question mark. I went into the disk utility through the Internet recovery (cmnd + r), checked the disk for errors. The utility showed a file system malfunction, tried to fix it with a native function, but the process hung for an hour. Reboot again and the disk is not displayed in the utility. I thought the ssd died and it was decided to put back his native hard.
After the replacement, the poppy started up and everything worked chiki-farts. I decided to update macOS in parallel while deciding the moment how I would go to hand over the ssd warranty. After installing the update, another reboot and the same thing. A folder with a question mark flashes. I connect the ssd back, I decided, since it writes file system errors and they are not fixed, I decide to format and roll a new axis. A new axis is installed and at the end an error. The axis was not installed and the disk disappeared again. I rolled a macOS flash drive for the test and the macbook came to life. Everything works fine. The joke is that the ssd also works, but periodically it disappears from the system. Only after a couple of reboots does it reappear. I downloaded an update (image) of 5.5 gigs to it, it worked fine, but sometimes it fell from creating a folder. In general, the disk flies off periodically, as I noticed only when it is loaded. Having rustled the Internet, we have a preliminary verdict - the Earth rest in peace to the hard drive cable. It's just weird that a drive either works or it doesn't.
Could it be that under load the cable heats up and opens? Tomorrow I'm going to buy a train and check this variant of the problem. There is another opinion, could there be a problem due to the south bridge? It was repaired a year ago + a violation of the power supply chain. I don't know for sure whether such a repair actually took place. The disk is determined according to my comments, if you turn off the Akuma power and connect it back and a little idle time in the off mode (let it cool down). I'm waiting for your versions, assumptions and exact answers where to drip.

Answer 1

Solved a problem. Replacing the hard drive cable of the MacBook Pro 13 a1278 mid helped.

Answer 2

It seems to me that the hard drive has nothing to do with it, most likely the whole thing is in the south bridge (speculation), and maybe not even in it.
But I can definitely say that your disk is not to blame for your problems. Look for the cause in the power supply and the southbridge.