Wireless Keyboard frequently drops connection after MacBook repair

Just got my MacBook (1st gen, Core Duo) back from repair from an authorized service provider. They replaced the bottom and top case because of cracks. Since then my Apple Wireless Keyboard (the new one from summer '07) keeps dropping the connection every few minutes. I've never had these problems before (running 10.5.1). The weird thing is that the "connection lost" icons pops up but I can still type. Batteries are at 60% the keyboard is just a few inches away from the MacBook. Can this be related to the new top case?

Hi Benedikt!
The Bluetooth module that allows your machine to communicate with the keyboard is located almost right above the opening to your optical drive on the right-hand side of the machine. It's possible that during reassembly the sensor was not reinserted properly or the short, thin, little wire that runs to the logic board was damaged just enough to "work sometimes."
As you just received it back, I'd recommend contacting the service provider and explain the issue that you're experiencing. The other option, if you have that available to you, is to try connecting another Bluetooth device to your machine and see if it too frequently loses connection. That way you can at least further determine if it's hardware related or peripheral related.

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Hardware Overview:
Model Name:          iMac
Model Identifier:          iMac12,2
Processor Name:          Intel Core i5
Processor Speed:          2.7 GHz
Number of Processors:          1
Total Number of Cores:          4
L2 Cache (per Core):          256 KB
L3 Cache:          6 MB
Memory:          16 GB
Boot ROM Version:          IM121.0047.B1F
SMC Version (system):          1.72f2
Apple Bluetooth Software Version:          4.2.0f6 12982
Hardware Settings:
Address:          7C-C3-A1-58-F0-90
Manufacturer:          Broadcom
Name:          Mike’s iMac
Chipset:          2046
Firmware Version:          v207 c509
Bluetooth Power:          On
Discoverable:          On
Connectable:          Yes
Auto Seek Keyboard:          On
Auto Seek Pointing:          Off
Remote wake:          On
Vendor ID:          0x05AC
Product ID:          0x8215
HCI Version:          0x4
HCI Revision:          0x1FD
LMP Version:          0x4
LMP Subversion:          0x21CF
Device Type (Major):          Computer
Device Type (Complete):          Mac Desktop
Composite Class Of Device:          0x380104
Device Class (Major):          0x01
Device Class (Minor):          0x01
Service Class:          0x1C0
Devices (Paired, Configured, etc):
Apple Wireless Keyboard mikes:
Address:          28-CF-E9-6D-3E-E2
Major Type:          Keyboard
Minor Type:          Peripheral
Services:          Apple Wireless Keyboard
Paired:          Yes
Configured:          Yes
Connected:          Yes
Manufacturer:          Apple (0x3, 0x31C)
Battery Level:          100%
Firmware Version:          0x0050
Vendor ID:          0x05AC
Product ID:          0x0256
Class of Device:          0x05 0x10 0x2540
AFH:          On
AFH Map:          FFDFFFFF1F00000
RSSI:          -49
Role:          Master
Host Connectable:          Yes
EDR Supported:          No
eSCO Supported:          No
SSP Supported:          No
Services:
Bluetooth File Transfer:
Folder other devices can browse:          ~/Public
When receiving items:          Prompt for each file
State:          Enabled
Bluetooth File Exchange:
Folder for accepted items:          ~/Downloads
When other items are accepted:          Ask
When receiving items:          Prompt for each file
State:          Enabled
Bluetooth Internet Sharing:
State:          Disabled
Incoming Serial Ports:
Bluetooth-Incoming-Port:
RFCOMM Channel:          3
Requires Authentication:          No
Outgoing Serial Ports:
Bluetooth-Modem:
Address:
RFCOMM Channel:          0
Requires Authentication:          No
System Software Overview:
System Version:          OS X 10.9 (13A603)
Kernel Version:          Darwin 13.0.0
Boot Volume:          Main-SSD
Boot Mode:          Normal
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One thing to try is to make the devices "favorites" Directions for that are in other posts of mine.
However, the keyboard (from your description) could be faulty. Since it is less than one year old, I suggest you call Applecare with a warranty issue. I had a KB replaced (in warranty) a couple of years ago. Apple replaced it and paid the shipping both ways.
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Wireless Keyboard frequently drops connection after MacBook repair

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