Navigation.PushAync() method issue on Lollipop devices in Xamarin.Forms ?

Hi everyone,
I am facing some issues in my Xamarin.Forms application with Navigation.PushAsync()
method but only on android lollipop devices. The app perfectly works on pre lollipop
and post lollipop devices and on all ios devices.
Here are the different scenarios of my application.
-I have a signUp page with two Entry(Email,Password) and when i navigate to this page from from my SignIn page
using await Navigate.PushAsync(new SignInPage()). The page successfully loaded and also has back button option on navigation bar but all the page functionalities got stuck, Entry don't show the text while typing from keyboard.
-In the same way i have another page with ListView but the page got stuck on loading and similarly an other page with Webview and it also got stuck when i navigate only the back button works.
-If i use Navigation.PushModelAync(), then it works fine on all devices including lollipop but its not my requirement. Navigation.PushAync() should also work on lollipop , i don't know why its behaving like Please help me out to get rid of this issue.
Thanks in advance