Maybe it's because you're out of warranty. Or they just doesn't have any more supply 

Yeah 2-3 weeks in europe.

Not sure but I think yes. But as long as you don't use nvidia 4000 series gpu u're safe.

It's nothing u can fix through updating soft- or firmware. U need a new piece of hardware. Like mentioned before: If u do RMA they swap the board and the "new" one have an other part number (90MB14L0-M0XCN1 instead of 90MB14L0-M0EAY0). It's the only ...