Default Account issue

[Wakey87433]

I keep getting this annoying issue with the default account. Randomly the App Store AppleID on the main account will switch to using the ID of one of the sub accounts. The iCloud and Game Centre ones remain as they should be. As its the default account you can't choose to logout and log back in like you can on sub accounts.

Does anyone know an easy way other than having to remove the default account everytime it happens to change the Store Apple ID back?

And more to the point does anyone have any idea what's causing this and how I can stop it happening

 

[-Gonzo-]

Can’t really explain why it’s happening without seeing it happen as it’s not something I’ve ever had an issue with.
The only time mine ever switches profile is if I bring up control centre and switch to the required profile. (Or if in the tv app and swipe left to engage the side bar then select the appropriate profile)