Hi guys,
Thanks for testing.
The only thing I can suggest is to try adding all of these to kernel command line options.
eg:
label kernel-4.4
kernel /zImage
fdt /rk3288-miniarm.dtb
append earlyprintk quiet splash plymouth.ignore-serial-consoles console=tty1 root=/dev/mmcblk0p2 rw init=/sbin/init dwc_otg.fiq.lpm_enable=0 dwc_otg.fiq_enable=1 dwc_otg.fiq_fsm_enable=1 dwc_otg.fiq_fsm_mask=0x3 dwc_otg.fiq_split_enable=0 dwc_otg.sped=1 nrpacks=20
Failing that, its most likely a case of waiting for kernel related fixes from ASUS, to improve USB stack.