iOS 7 app termination issue

iOS 7 app termination issue

I am working on an iOS application which gets terminated by iOS after
hours (4-5 hrs) of inactivity in background (I have proper logs which
support that iOS terminates the app and moreover I see no crashes in the
app). I understand this is pretty usual as iOS has the right to purge the
memory of the app and terminate it under any memory pressure. Moreover iOS
7 is still in beta phase, so I am sure there are improvements waiting to
show up in the market version.
But what baffled me is it is happening more often in iOS 7 than iOS 6. I
ran tests on iOS 6 and iOS7 with the same number of apps running in
background along with my app. After a few hours I see my app getting
terminated in iOS 7 and not in iOS 6.
Now my question is there any evidence about apps being terminated more in
background in iOS 7.
Moreover do you see the new background modes introduced in iOS 7, fetch
and remote-notification, do any good to my app from being terminated.
Note: My app has the background mode set as "App communicates with an
accessory". I tested my app on iOS 7 Beta 6 version.