MBWE not detected by wd discovery and my computer after sleep mode or shutdown

I have had MBWE since nov 09. I can use it on 2 network computers. When I shut down the computer or put it to sleep, I can’t reconnect to MBWE. I get a message from windows that it can’t be found. Same with WD Discovery. I have to go to MBWE, shut it down then restart and at that point the drive becomes available to connect to. What can I do to fix it, it’s really a major problem to me.