Alfine 8 crunching/grinding in highest gear I have recently bought a bike with an Alfine 8 hub and it was working well for the first week or so. Then there was a couple of gear drop outs whilst I was riding so I made sure to line up the yellow lines at the back.

Since then I've experienced a horrible noise coming from the lowest (easiest) gear whenever I put any reasonable weight on it. If I use it on a perfectly flat surface and peddle slowly then it's quiet but as soon as I try to pedal with any speed the hub starts making this grinding/crunching sound.

Moving the lines slightly OUT of alignment actually reduces the noise but causes problems with other gears.

Should I be sending this hub back to Shimano?

I've attached an image of my yellow lines lined up.
I was all set to return the Alfine hub to the manufacturer and when I went to take it off I realised the wheel nuts were loose. Tightening the nuts solved the problem. It seems the hub not being fixed in place was causing it to be moved in the wrong direction and shifting to the lowest gear was pulling the mechanism too far inside the hub.