I am new to voip and landed on mizudroid. it provide push notification which is great. But there is a problem today:

I checked my voip.ms registration status. my phone most of the day shows not registered when phone is idle, so is my wifes'. here is the picture:

when I am runing the mizudroid , mine shows registered with mizudroid. here is the picture:

my wife's showd registerd with mizuFCMpushproxy. I like that. here is the picture:

So most of the day, If I registered, she can't receive call from me because she is not . and vice versa.
yesterday and before, most of the time shows registered by mizuFCMpushproxy, which means it is registered by mizu's push server , that is good because our phone will receive push notification so we can call each other.  When I am registered shows mizudroid 2.7, that means once I put my phone in my pocket , it is de-registered and I won't receive any call. 

Is this a temporary mizu push server side problem or I did something  wrong?