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AM3354: USB issue

Part Number: AM3354

 Dear All

I confige USB OTG as host mode.it will appear some issue when insert U disk

It will convert from "host_mode"  to "wait_b_conc" status,next from "wait_b_conc" to "host_mode" status,and then become "wait_b_conc" status

I think from "host_mode"  to "wait_b_conc" must meet three condition:1.ID become high,2 USB unpluged,3 VBUS fall.but this three condition not appear,pls help provide suggestion