Make sure bobbin area is clean of all lint, etc.
I'll be watching here in hopes of finding suggestions as it's so frustrating to have to struggle.
The newest of my three sewing machines is 37 years old so I'm not much help otherwise on the newer machines, but there is so much wisdom on tap among these folks, there are bound to be answers.
Your [QUOTE:] "...those stupid birds!!!" [UNQUOTE] -- prompted one to wonder if maybe your sewing machines have been infected with that new 'angry birds' computer game and are gathering nesting components...?
SORRY for the silly pun! It just led into it...