MacBook randomly shuts off and gives flashing folder symbol.

Last December my Mac shut down and gave me the flashing folder.

Command + D diagnostics gave me “There may be a problem with a storage device” and it would not boot. macOS nor Bootcamp would appear on the options list.

Then an hour later it started working, and unworking, etc. It would randomly freeze up and shut down and either restart or give me a flashing folder.

The SSD is 1TB and in perfect health. This is the highest tier model with the 2.8 GHz i7 and the 1TB SSD and I have no idea what is wrong.

MicroCenter said that they could not find the problem that we showed them

If it helps: This got a repair earlier in the year for a top case replacement because of a fried keyboard module. And, this problem happened with 10.14 Mojave and also with Catalina. Plus the SSD does not show up in bootable installers sometimes when trying to wipe the drive. It has been decrypted and such, I’ve tried everything Apple has said.

Is this the infamous random restart problem everyone is talking about,

Thank you!

Update: I cannot find the error log and find code 118 (which is related to the widespread shutdown issue) because my mother persisted that I keep trying to reinstall macOS even though it kept throwing error messages (She once thought that my web browser was causing all of it. Not an online virus through it, the software itself.)