Oppo R7 App blocking Sporadic

Hello forum,

Having mixed results with child's Oppo R7 (OS Fully up-to-date) and most recent version of NF

My child utilises the device mainly for entertainment/games - it has no SIM, Wifi Only data/internet

As a 'test', I selected 3-4 apps to block via App House Rules.

If I try to open any one of the 'blocked' apps, no problem - they open and function as normal. If I open the NF app and then try to open one of the 'blocked' apps - they are blocked as expected...

I have been through all the battery/Safety & Security/background data settings as suggested in other posts (i.e. Huawei P8 issues)

It seems to me that the NF app does not stay 'resident' (as an antivirus product does).

Location seems to be a bit intermittent also... sometimes it works and sometimes it doesn't (within the web management) - this the case the Oppo and my son's iphone

Notifications is another area that is lagging... from the time of the event to an email being received is hours apart - way too long!

This is about 5th or 6th product of this type that I have trialled - there just seems to be NOTHING out there (that works as it claims to)

:-(