Bluetooth Mouse stops working after software updates

Hello,
I've been using a Bluetooth mouse with my X220 Tablet for several months now. After fiddling with device manager to ensure that the Thinkpad Bluetooth device does not have the "Allow the computer to turn off this device to save power" setting set, things were working perfectly.
However, after running through some windows & Lenovo updates, the mouse now seems to work for a while, but after any idle time, the mouse stops working. Turning the mouse off & back on seems to cause it to reconnect, and it works until the next time it goes idle for 2 minutes.
I've gone through device manager, and made sure both the Bluetooth & USB Root devices are set not to power down (per http://forums.lenovo.com/t5/X-Series-ThinkPad-Laptops/Bluetooth-mouse-stops-working-from-time-to-tim... ), but still no luck.
The software updates applied from the Lenovo System Update tool were:
ThinkPad Power Management Driver: 1.67.04.05
ThinkPad Power Manager: 6.64.4
Lenovo Solution Center: 2.4.002
Intel G1/G2 Display Driver: 9.17.10.3347
Also, some windows updates which don't seem related (mostly security), but I can lookup the list of KB numbers if helpful.
Are there any known issues with the power manager updates that might affect this? If so, what's the best way to revert to the last working version?
Thanks!

Try doing a PRAM reset and see if that helps, also put in new batteries as that may make a difference.
OS X Yosemite: Reset your computer’s PRAM

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