I spoke to someone myself about this at Eco ComfyBed as was starting to find the same myself......
Apparently they had to buy a new shredder or something and now they have changed one of the pieces on it which is giving them much more like the old product which I love. Something to do with the wood being ground up for longer so it was breaking down in the stable a lot quicker than anticipated but its taken a couple of months for the problem to rear its head.
All back to normal now though I am assured! Though he did say it can take a bit of time for the improved product to filter through to us the customer.
Hope that helps, if not, do what i did and contact them through their website and left a number and they called me back really promptly.....very good service I must say
It does help, thank you. I was aware that they'd got a new chipper - it does seem finer now but the dust was really annoying me. Hopefully, as you say, they are aware of the problem and got it under control now