Usb mouse auto disconnect time and time,Screen flash and flash when I use discrete graphic card

as title
My usb mouse auto disconnect and reconnect time and time,
no one knows when the mouse will disconnect,but every time when that mouse disconnect ,it will be reconnected in 2-5sec.
Screen flash and flash when I use discrete graphic card with the battery or use AC when connect the external display with VGA CABLE.
Mouse: Logitec G400/G1
Display:Lenovo D2081WIDE
machine:T430 2349 CTO

system info:
machine TYPE: THINKPAD T430 /2349CTO
operating system :Lenovo OEM ultimate X64 SP1
mouse type:Logitech G400 and Logitech G1
time:from 2012-10 to now
threat NO.1
USB mouse auto disconnect and reconnect time and time,no one knows when the mouse will disconnect,but every time when that mouse disconnect ,it will be reconnected in 2-5sec.
 every time when the mouse disconnect I heard the sound which like USB DEVICE unplug,and when it reconnected I heard the sound which like USB DEVICE plug in.
threat NO.2
Screen flash and flash when I use discrete graphic card with the battery or use AC when connect the external display with VGA CABLE.
threat NO.3
the battery auto losing capacity!!!!!!
1% everyday about 0.2Wh
since I bought to now,
the Design capacity has losing from 57.XX Wh to 47.52Wh
and full charge capacity is 48.68.
the battery info:
cycle count is 18
Bar-Code number 1ZKFD27S1RF
SerialNumber 1896
First used date 2012-09
FRU 45N1001
Firmware 0003-0080-0100-0165

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