[Grinding/crunshing noise Um3]

https://www.youtube.com/watch?v=10OokMlLkBA&feature=youtu.be

What could be causing the crunshing noise

[Nozzle too close to heatbed despite auto leveling]

I got my UM3 about 2 Months ago and it always worked perfectly but for some reason the auto leveling sets the nozzle way too close to the heatbed , which causes clogging.

How do i fix this , what can I do ?

Btw:

I did manual leveling but it didn't help