My 10s pro had been working like a charm! I am on my third roll of filament and it’s been only getting better. 
pictured is what happened. 
filament is overture PLA. 
noticed a rattling type sound when I started the machine over the last several prints. Seemed to go away as the machine warmed up. 
has this happened to anyone? I Pierre down the machine and have not run it since I saw this today.