Sorry for my poor English

I use moto 360 gen1 with my mx5.
The problem is the moto 360 always disconnect from my mx5 after the screen of mx5 off about 3 minutes. So I think the problem is from android wear app was killed by the system. I tried to setting in the security app to allow android wear app to run in background not to banned it but it still happen.

Anyone face the problem like me?
Solution?

Thanks in advance.