slow ethernet connection​g with Beagleboar​d(Rev B7)


I have beagleboard(Rev B7), and I have connected ethernet to it with the use of USB OTG.
when I start sending a file(28 MB), it starts with a good speed (approx. 150 KB/S), and within a minute it comes down to 0 KB/S.

Can anyone tell me what is the issue , and how can I overcome it?

Thanks & Regards,