MacBook Pro 13 2012 why do the lid bolts unscrew by themselves?

Question

macbook

1 Sobsna, that's the problem, my poppy survived the replacement of the mother, and now it is haunted by a rather strange misfortune: the bolts of the bottom cover become loose over time, and if they are not tightened with a screwdriver, they completely fall out, moreover, this misfortune applies to both short and long bolts, I don’t know if I should apply sealant to the threads before tightening.
Naturally, I almost never turn off the Mac, he spends all his free time in sleep mode, I work in Adobe programs, the temperature fluctuates around 60-75 degrees, I carry it in a case. I have no idea what this bullshit is coming from.
2 And, here’s another question, how can I find out the detailed characteristics of my mainland, serial number, production date and all that, otherwise they could have cheated in the service by slipping me a restored one, etc.
Please share your thoughts on the questions raised

Answer 1

Everyone has already written about the screws, they are unscrewed from vibration, often you carry it with you. It’s a disaster for bikers there in general, and internal ones are also unscrewed very quickly. If they are not stretched and fixed.
As for the characteristics, then here: https://geektimes.ru/post/285624/
If the board was changed recently, then in the 17th year I think it is no longer possible to find a new board of the 12th model year. They have been out of production for a long time, and stocks in warehouses are limited. But if it is restored by an official Apple repair plant, then this is not scary.

Answer 2

1. Buy a blue threadlocker at any auto shop
2. https://geektimes.ru/post/157969/

Answer 3

Blue fixative or take old nail polish from the girl.