X10 R9000 Bitdefender update & iOS appstore issues

Hi, 

I just recently installed my X10 R9000. What a monster! :)

Sadly already encountered two issues:

- iOS devices (iPhone, iPad,...) connected to the router can't download or update apps 

- Bitdefender anti-virus is unable to update virus definitions

I'm sure it's the router as these functions work perfectly when connected to a different network. 

What could be the problem here? 

Everything else works fine. Gaming, streaming, network printing, Plex, Synology... No problems, but the two above. 

Seem pretty basic functions, can't imagine I have to forward ports for this? 

Can anyone help me with this? 

Cheers