protocol 0806 is buggy, dev usb0

I have a ZTE MF823 modem (kernel version is 3.12.27) using cdc-ether driver
which gives a usb0 interface. It works well for the most part, but I keep
seeing the below messages in dmesg once in every 5 seconds. Its clearly
complaining about the ARP packets, the modem has some instability issues,
not sure if thats related to this message. A googling doesnt give much info
other than users reporting this once in a while - if anyone has more info
about this please share, that will be of great help !

"protocol 0806 is buggy, dev usb0"

Rgds,
Gopa.