usb-storage: waiting for device to settle before scanning

Problem with my usb device (sansa e270 mp3 player)

Eventually if I keep replugging it in it is found but it’s a pain and was fine in 11.0

dmesg|tail:
usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 2-4: Product: Sansa e270
usb 2-4: Manufacturer: SanDisk
usb 2-4: SerialNumber: 00000000-00000000-4176b387-d915fe07-00000000
usb-storage: device found at 34
usb-storage: waiting for device to settle before scanning
usb 2-4: reset high speed USB device using ehci_hcd and address 34
scsi36 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 34
usb-storage: waiting for device to settle before scanning

thanks,