External drive works with TC intermittently

Hi there,
I bought a 1TB TC about 4 months ago after my last backup drive failed (at a fairly inopportune time I might add). I have decided to take some extra steps to ensure I don't lose my data again.
I have bought a USB hub to which I have attached a printer, a 250GB HD and soon I will attach a 1TB HD.
The problem I am having is:
1. The 250GB HD, when initially connected works fine (mounts, is searchable, no issues)
2. If I wait a couple hours and try to remount it, it stops working (light turns off on front of enclosure)
3. After it stops working I can no longer print or back up with time machine until I unplug the hub, unplug the router, plug the router back in, wait till it starts (to green light), then plug the hub back in.
4. After going through all that, the process starts over.
Some interesting points:
1. when the HD initially stops working I tried removing it from the hub. The hub power light turns off as well as the TC light for a brief moment (as if the HD was providing them a fairly significant amount of power)
2. Internet doesn't stop working through any of this.
3. Airport utility cannot read TC Configuration after the 250GB HD stops working.
Thanks in advance,
Kyle

There are three I recommend, they are all similar in features, build quality and price. BTW at the minimum I would recommend a 1TB drive and try to get larger, the reason being is all TM drives eventually fill up so the larger the drive the more backups it will store.
G-Tech G-DRIVE series
LaCie d2 Quadra series
OWC Mercury Elite Pro series
Personally I have 4 of the LaCie's, I've had them 4+ years and all have been dead reliable. However the G-Tech or OWC's would also be welcome on my desk.

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