Disklavier

I have a Mark IV Disklavier.  Can the group  share the latest and greatest 
ethernet adaptors that you've found work the best  for the Disklavier's 
internet connection?  I have tried Netgear bridge  XE102, Netgear powerline 
av+200 and D-Link DHP-302, but neither seems to really  work consistently.  I'm 
having my it guy out tomorrow to make sure it isn't  my wireless connection 
on the whole, but I wanted to see if there was a  particular brand/model I'd 
have more success with.   

Thanks.

Jane