Since only a small part of users is experiencing this we really need to have more info. Possibly (some part of) the router is broken. But since it is a problem that derives from a driver/program that is depending on the host Operating System the cause can just as well be in that area. Especially since 3 out of 4 devices in one and the same home situation have no problem with printing!. That kinda excludes a router malfunction, wouldn't you say?
My configuration is as follows:
2 computers - WinXP SP3 (32bit)
2 computers - Vista Home Premium (32bit)
One of them (WinXP) is wire-connected,
All the other 3 computers are wireless-connected.
2 USB devices -- HP printer and the external hard disk --
are connected to Shareport thru the USB hub.
After rebooting DIR-655,
the shareport function on each computer works OK.
I can connect the USB device from any computer when the device
is available(i.e. not connected to other computers).
But, after several hours (or minutes, not consistent),
the USB devices become disconnected (i.e. available status) from all computers.
Then, I cannot connect them anymore from any computer.
( One of computers is very fresh (just bought) ).
The only way to connect is rebooting the router.
(The USB hub doesn't matter for this problem
because even, without the USB hub,
only one USB device (either printer or hard disk)
directly connected to shareport also has the same problem.)