Lenovo p780 wifi connectivity problem

i installed miui v7 5.8.27 ,
wifi connectivity is found poor and even the it shows signal is strong it displays message no internet connectivity switch to other.
help to solve...
thanks in advance

always disconnected after pairing with Lenovo P780

recently I've bought ASUS zenwatch. But after pairing with my Lenovo P780 running on Kitkat 4.4.2, it's keep disconnected and cannot connect.

I have check my Google Play Service, Google Now, and all programs need to be updated, all checked.
I tried to reset device my zenwatch 5 times, and still after pairing with my P780 it will disconnected. The Initialization was running and the Setup done on my zenwatch, but in my android wear on my phone just gets status Updating. And finally Android wear in my phone just says "Trying to connect" .

I also try to bluetooth connect with manual connect from both my phone and zenwatch, and stll after pairing request, it's just disconnected.

what should i check now? :crying: