Game lags when there is no internet (iOS)

Hi guys,

I have a strange problem and I've tried everything I could so far and the issue's still not fixed. I have a ready game which I want to publish but this bug is keeping me from doing so and it's frustrating to say the least.

What happens is that when I build and play the game on iPhone, if it's not connected to the internet (wifi), the game lags every fixed amount of time. Sometimes it seems like it's every 20 seconds, sometimes every 23 seconds, etc. You get the idea. If I turn on the internet, the issue goes away.

I suspect it's because of one of the SDKs that I have: Chartboost, Game Analytics or Everyplay. It may be trying to pull some data from the server and when it encounters no internet connection, that's when the lag happens (sometimes it lags so hard that it stops the entire game for 1.5-2 seconds). Out of those three, I suspect the former the most and the latter the least but at this point, I'm so confused that I'm ready to believe/try anything.

I know this explanation doesn't provide much to work with and I can't even put a code sample because I have no idea what's causing this, but I though I'd still ask here. Maybe someone had a similar issue and can point me to the right direction.

Thank you in advance!