Bluetooth connectivity problem: sees the mouse but reports it's not detected at the same time

All of sudden my mouse lost connection to my Mac. When clicking bluetooth icon in menu bar it's highlighted in bold and marked as "connected", but when I open Mouse Preferences all I see is that it tries to scan its presence and in fact is stuck at this stage. The charge is enough. More so, I wasn't able even to both disconnect the mouse and turn off Bluetooth. Console logs were the following:
20.03.15 10:50:48,000 kernel: AppleUSBBluetoothHCIController::SendHCIRequest on suspended device! Data begins with: 0x01040533
20.03.15 10:50:48,000 kernel: SendHCIRequest failed, error (0xE00002D8) -- kIOReturnNotReady[SendHCIRequestFormatted] ### ERROR: EnqueueRequestForController failed (err=0xe00002d8 (kIOReturnNotReady)) for opCode 0x0401 (HCI Inquiry)
20.03.15 10:50:48,000 kernel: [SendHCIRequestFormatted] ### ERROR: [0x0401] (HCI Inquiry) -- Send request failed (err = 0xE00002D8 (kIOReturnNotReady))
I took bluetooth plist from my User Library and moved it to Desktop then restarted. After that the system created the new plist and the problem disappeared.
You may ask why I'm starting the thread? Well, partially because I got frustrated not expecting such Windows-like behavior but mainly because I'd like to bring an order to my knowledge for understanding certain OS X shortcomings. Could you please look into these plists - the older and the new one - and tell me where is the crucial difference between them that led to connection failure?
Old bluetooth plist:
The new plist:
I.S.

Since the version of OS X I use is soon to be left without Apple's support and Apple does NOT supplies Lion users with system updates my feedback is going nowhere. I know this is user-to-user forum,  I just was hoping for some clarification, but if you don't know the answer, so be it. Ok then, thanks for your help. Much appreciated.

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