BMW E82 123d coupe hatchback starter-electric problem

[Ascenso]

Hello,

I am Joao from Portugal and I have some electric/starter problems in may car, the car is a BMW 123d from 2008 with 280000 km.
I bouth it second hand in January 2022 and it worked perfectly until this june.

1 - The car started with a loud cracking noise
- turned it off but another lower noise continued
- started it again and now the loud cracking noise disappeared
- drove it half a mile and stopped it, never started again and no dash lights like dead.

2 - took it to a mechanic and it was a oil leaked from the valve cover that got to the starter and the starter was burned.
- the leak was repaired
- the starter was repaired
- burned fuses replaced from the dashboard and some others.
- all working as intended

3 - 3 days after the repair the car didn't start, pressed start and nothing happen
- took it to the mechanic he disassembled the starter, the starter was ok, he did not find any problems and the car was starting again...

4 - a few days later the car started but with loud cracking noise again, I did not stopped it and took it directly to the mechanic and I advise in to change the starter to a new one
- the starter was dead
- he replaced the starter with a new one
- car working again.

5 - ONE day later the car started with the same loud crackling noise...
- the NEW starter was dead...
- the mechanic changed the starter to another one he had
- car starting again

6 - one day later the car did not start again, pressed start and nothing happen
- I tried during 3 days to start it without success, I roll started several times, it always roll starts easily, but never starts manually.
- took it to a BMW official center and as soon has the car enter the building the problem never happed AGAIN!! they didn't find any problems or errors while the car was there, it has there for 4 days...
- took the car home again
- one week later did not started again, but did start again 15 minutes later
- another week later (today) did not start and it has been not starting for about 3 hours.

I don't know what to do ....

Sorry for the long story and my bad English...
Some advice would be appreciated.

[Ascenso]

hello,

Yesterday it started 3 times in a row but after turning it off it kept making this sound:
https://youtube.com/shorts/DfdCiSrDyko?feature=share
(I used video to record sound...)

Then I drove it around the block, stopped it, and never started again.