Samsung S4 LTE i9505: Wi-Fi and Bluetooth Failing to Stay Activated

Hello,
I own the SAMSUNG S4 LTE (i9505) and for some time I have a problem with Wi-Fi and Bluetooth, I can not turn them on. After clicking the module as if it wanted to turn on (dark-green color), and after a moment it turns off. Sometimes after the phone reboots, the Wi-Fi module turns itself on and both modules (Wi-Fi as in BT) work until it is restarted.

Reading various forums, I tried almost everything:
- factory settings
- reinstal system (official rom, I never installed anything unofficial)
- IMEI is compatible

Android 5.0.1 (I got it from my brother already on this system and it worked for a long time)
Everything except these two modules works

I am asking for some advice

Try to upload the wifi fIx yet, here:
https://youtu.be/ykG8HEYHxp4
as if there is nothing to it, there is a system failure on the board, or you can check if you have an antenna on the board (but this is unlikely).

Hello. The main question is whether the phone has not had contact with moisture earlier? Prophylactically open the check visually whether you can not see any traces of water elements responsible for wifi bluetooth can be hidden under metal screens, it is also worth to disassemble and check them. greetings

As for Wi-Fi Fix - I will do a data backup and try.
The phone did not fall into any water, there was no possibility that the water would get under the casing.
Antenka is attached at 100%

Added after 10 [hours] 27 [minutes]:

If I understood the video correctly, then at the stock room, we do not upload this file 3?

i9500 does not have LTE, i9505 is LTE and i9506 is LTE +, i.e. S4 with better prock and graphics Let's add a few other versions of S4 to this ... For me there is a difference between these models, just like the processors in the computer - someone has i7, but exactly what ... i7-4710HQ (laptop model) i7-6700K, or maybe i7 -6900X? The differences are huge
So the issue cleared up - 100% i9505
As for the ROM - I have never used a custom ROM on this phone, so it's the official 5.0.1 and I'm not going to change the custom for anything I value Touch VISA in S4 too much ...
I do not know if this is difficult to understand, but Wi-Fi and BT stopped working with each other and not after changing the system ...
If it is a mechanical failure of the plate, can you fix it somehow?
A and Wi-Fi Fix with the first answer nic nie pomógł: /

You can try to heat this system like in this movie:
https://www.youtube.com/watch?v=pCUUP3DbJv4
Sometimes it helps but it can help just for a while and then the problem can come back again. If it does not do anything, you will have to exchange this system.

Typical fault s4, you need to replace or heat the chip that your colleague sent you higher.

Hello. I have the same problem, namely if the phone has one line of wifi coverage, it disconnects every now and then. if it has so it is a stable link. Someone wrote that there may be a problem if the phone had contact with moisture. If he had what to do?

I changed my phone