This falls squarely in the category of "nobody will ever believe it" but I thought I'd post it anyway, on the off chance that somebody else may encounter the same problem.

Here's the situation:

I'm sitting in the motorhome basking in the warm winter sunshine (I know, "oh woe is he"),
and I'm working on some BIAB stuff with this set up -

- ASUS EP121 tablet (has 2 USB 2.0 ports and is running Win7 Home)
- An ASUS BlueTooth mini keyboard (came with the tablet, is actually branded ASUS but the back says "Microsoft Bluetooth Keyboard 6000)
- one of the USB ports holds the BIAB 2013 drive
- the other USB port holds a 4-port USB 2.0 port-replicator
- one of those ports contains the dongle for a run-of-the-mill wireless mouse
- another of those ports holds a Sandisk Cruzer 32 GB thumb drive

The problem is with the keyboard.
A quick trip to an EP121 forum assured me that I wasn't the only one having problems with it.
There were many others who would also lose the "connection" to the tablet.

When mine would stop communicating, I would go through (after considerable mumbling under my breath)
any one of a few "remedies" to get it working again, including just putting the tablet into sleep mode, then re-awakening it, which DIDN'T work.

One particular day, after having this happen 2 or 3 times in a one-hour span,
I decided to just leave it. I didn't turn anything off, just put the tablet into sleep mode,
and walked away.

Several hours later, after I had cooled off, I came back, awakened the tablet, and the keyboard worked just fine!!!

Somewhere in all of the above rigamarole, I found the solution.
I can now get the keyboard to talk to the tablet anytime it decides not to.
I'll give you 3 guesses to see if you can/could have come up with MY solution.

Here's a couple of hints:
- it has nothing to do with any settings on either the tablet or the keyboard
- it takes 2 or 3 minutes to complete the task.

I'll post my solution after some of you have had a chance to think about it and post something.

Good luck!
LLOYD S