Here's the thing, party application is really important in multiplayer games because it lets you communication with your team mate like in SS or Killzone. The problem is, this PARTY APP keeps on disconnecting during the game and it requires to close the game entirely in order to start again the Party Apps which is really annoying.
Please fix/improve this on next update in which it allows us to start again the Party App without closing the game.
The game might be reloading because your playing online and if your connection is broken it might freeze or what have you. If its a router issue that could be whats happening.