MacBook Air (Mid-2011) keeps shutting down

[greg1467]

Hi,

I have a MacBook Air "Core i5" 1.7 13" (Mid-2011) 10.13.6 macOS High Sierra

MC965LL/A* Model A1369 (EMC 2469)
Family Mid-2011 ID MacBookAir4,2
RAM 4 GB VRAM 384 MB
Storage 128, 256 GB SSD

My MacBook constantly shuts down when it's idle for 10 seconds. If I use touchpad or mouse it's fine.
Randomly ( on an occasion I get the "Are you sure you want to shutdown your computer now" popup and even then if I do nothing for 10 secs it will shut down.

I already tried SMC and PRAM restarts but luck.

There are days where it works just fine for an hour or so.

Any suggestions, please? Is this more hardware issue or something else ?

Regards,

Greg

 

[MultiFinder17]

Does the keyboard work? It sounds like something might be holding down the power button or shorting it out inside.

 

[greg1467]

Does the keyboard work? It sounds like something might be holding down the power button or shorting it out inside.

The keyboard seems to be fine.
I also ran the hardware diagnostics and no issues were found.