Game minimizing on another PC in same house

Does this help?

If not, try uninstalling and reinstalling the Origin client on the PCs. (It's a quick process.)

Thanks . I have loaded tonight but seems to only happen whilst one of us is actually in a game playing. We tried about 2 hours ago while loaded into BF without being in a game was fine.

To add on to @EA_Atic's post, make sure each PC has a distinct IP.

You can run ipconfig at a command prompt. 

@EA_Atic   @DarthFDG   All 3 PC's have their own individual IP's I have always set them manually. @EA_Atic no no-one disconnects. Let's say if my son is just waiting on the Mode selection screen and I load my BF up it's fine, but if he is actually playing a in game, it just minimizes to desktop. No DC whatsoever.

@EA_Atic Tabbing back in works yes. Does not crash just minimizes. This part you wrote " Do you have any program that talk with each PC on the network by any chance? " I don't understand what you mean sorry

@warman001some software thats installed at all pc? home network, or some private chat software , anything thats installed to "communicate / connect" with other pc's ?

@Rokebo73  Teamspeak 3 is the only software used to chat through nothing else. No other is installed

Try to disable the ingame overlays/notifications of Origin/EA Desktop.