This sounds just like a problem I am experiencing. I have a 3-day-old drive. The difference I was only using the drive for shared files and power was disrupted. At first I thought it was because of the power loss, but now am wondering if there is an underlying issue.
Was connected via Ethernet to Apple Airport Extreme
SP
If you suspect that the media server in the LinkStation has frozen, you can use the Maintenance page to tell the LinkStation to reset to factory defaults. This won't delete any of your data, but it will clear ll other user settings. However, it also forces all of the services to purge their cache files and logs, and restart.
I have seen issues on my own PS3 when a certain file fails to stream properly. It seems that once the DLNA connection is disrupted, BOTH the PS3 and LinkStation need to be rebooted, as doing one or the other doesn't help. The odd part is that it seems to be limited to the PS in this regard, as my laptop can still see and access the shared media.