The WIFI signal level on the laptop has dropped wildly. Cause?

Question

Lenovo

Good evening, the level of the WIFI signal dropped sharply, 3 meters from the home router and only 3 divisions, and so with all access points, demolished the drivers, reinstalled the system, nothing came of it. They advised me to look "under the hood", look at the number of antennas, I was embarrassed that only one is connected, the second is not at all (although there should be two as far as I know), I looked all over and did not find anything. This is such a vicious circle

Answer 1

If it used to be normal, then it's not about the number of antennas.

Answer 2

Open the cover, most likely the contact has fallen off the board at the module. I had it)