CUAV Mavlink minimosd OSD text reboot when GPS locked

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What steps will reproduce the problem?
I bought CUAV Mavlink minimosd for my CX20, APM 2.5.2 v5.0 stock firmware. I 
install to the UART Port, Tx and Rx crossed. connected to the Boscam TS5823 fpv 
and sj4000, both using external battery. everything works fine. OSD data and 
sj4000 video can be shown on the screen.

But it got one serious problem. every time when the GPS locked(steady green led 
light). the OSD text keep reboot, but the sj4000 video keep show up. The text 
keep rebooted forever. 

What is the expected output? What do you see instead?
The OSD text keep rebooted forever if GPS locked.

What version of the product are you using? On what operating system?
CX20, APM 2.5.2 v5.0 stock firmware. I install to the UART Port, Tx and Rx 
crossed. connected to the Boscam TS5823 fpv and sj4000, both using external 
battery.

Please provide any additional information below.
OSD board Pad not solder yet

Original issue reported on code.google.com by [email protected] on 18 May 2015 at 3:16