Magic trackpad stops responding on wakeup after upgrade to Mavericks

Question

I have a 27" iMac purchased in July 2011.  I never had any issues with the trackpad before upgrading to Mavericks.  I upgraded a few months ago and started having sporadic issues with the trackpad.  When the iMac woke up, everything seemed fine at first.  About once or twice a week, after it had been working for about a minute (just enough time to start web browsing), the trackpad would suddenly stop responding.  It then progressed to being more consistent (every other day).  The cursor was still visible and the keyboard still worked.  The trackpad was still on but apparently not connected.  I thought it was the batteries, but new batteries didn't help.  I could get the trackpad to work again by using Spotlight to open the Bluetooth System Preferences.  The trackpad worked immediately when Bluetooth preferences were opened (nothing needed to be changed; it would just start working).  However, it would stop responding after about ten minutes.  It was interesting because even if I left the Bluetooth System Preferences open, it would still stop responding after about ten minutes.  I could use the keyboard to make the preferences window active and it would immediately work again.  It would then work again for a few minutes and then stop.  I found that removing the trackpad and re-connecting it would cause the trackpad to start working again more consistently.  It would only stop if the iMac went back to sleep for an extended period (overnight). 
For anyone else with this problem, helpful keyboard shortcuts are cmd + spacebar to open Spotlight, type bluetooth, use the arrow keys to go to Bluetooth system preferences (hit enter), use the arrow keys to go down to the trackpad, press spacebar to unconnect, again to confirm, and then after the trackpad is automatically rediscovered, press spacebar again to pair it.
This went on for about a month, when I had what I suspect was an unrelated problem.  The trackpad started acting as if it was being held down (left click was always being pressed).  I took it into the Apple Store and they confirmed it was broken.  I was a little disappointed since it had basically expired about a week after my AppleCare expired, but luckily the folks at Apple took care of me.  (Thanks Apple!).  At that point I had a brand new trackpad. 
The issue had gone back to happening every other week or so.  I thought it might be interference, but I've since physically moved apartments and all the objects around it. It's been a couple months now and it's back to happening every couple of days or so.  Since the trackpad is brand new, I have to think this is a software issue.  I've noticed the following consistently:
1) It only stops responding if I've put it to sleep (I usually do so with a hot corner, but I don't have any reason to believe that's related) and haven't used the computer for more than 12 hours.
2) It'll always work right when it wakes up.  It'll stop fairly consistently 1 - 2 minutes after waking up.
3) Time Machine seems to be busy doing something when the trackpad stops (the little icon is spinning in a circle if I have a Finder window open).  Uncertain if it's always doing something or if it's coincidence that I've noticed it more recently.
4) As mentioned above, opening the Bluetooth System Preferences will always get the trackpad to respond, but then it'll stop after a few minutes.  Unpairing and reestablishing the pairing will fix the issue for awhile (at the very least until the next time the iMac sleeps).
5) I may be imagining this, but before upgrading to Mavericks, I think it used to show the message that the trackpad was connected when the iMac woke up.  I no longer see that message unless I remove the connection and setup the pairing again.
I've seen lots of people with various issues with Bluetooth connectivity and Mavericks.  I'm on 10.9.4.  No one seems to have exactly this issue.  If anyone has any suggestions, I'd appreciate them.
Thanks!

Answer 1

Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Please take this step regardless of the results of Step 1.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.