Instinct 2 Solar auto restart when I am running

Hi guys,

My Instinct2 Solar worked well since I bought it. But I found when I updated it to 8.66 version, It will auto restart for several times when I am running.  

Then I found when I was using my First Data Screen(Layout 5 Fields, F1 Heart Rate/ F2 Timer/ F3 Distance/ F4 Last Lap Pace/ F5 Time of Day), it must restart. But when I was using the Second Data Screen(Virtual Partner), It was alright while the whole running. I tried to turn the second screen to the first one, the restart will be happened.

I also tried to reset the watch to default settings, but it will also auto restart. 

Help me, How could I do?

Thanks a lot ! ~