Wifi sometimes cannot be connected

Hi, I just want to share my experience and maybe help someone. This is my solution for the problem above.

My macbook was in a repair shop for battery replacement. The guy in the store replaced it with some new battery. After that my mac sometimes could not connect to wifi and it would just appear as if the mac did not have the right password. If I typed in the password it had worked only a few times. Other times it just would not work. It was terrible. Also, my airpods could not connect to the mac anymore. There was not any useful advice online. So I had to sit and learn something about macbooks construction.

I found out that the guy form the repair shop did a bad work. He unplugged 2 of the 3 anthena connectors on macbooks motherboard(maybe by an accident). So I had to carefully plug them down. After a couple days of testing it seems that this was the problem.

I am not sure if this is the right place to write my experience and solution. If not then please advice me where or If I should post this experience. Thanks!