If you're reading this article, in most cases you have received an 'error message' from WOWAPPS saying your recent order has failed because you have Pass-Thru printing turned on and your POS was turned off.
However, this may not be the case. Your POS might have already be turned/left on. In the event of this, Kounta has suggested you try the below steps/Options.
Option 1
It's worth re-affirming that if the iPad is locked, the screen is asleep, or you're in another app the Pass-Thru printing will absolutely fail and it does take about 30 seconds or so for the iPad to reconnect to Kounta HQ
Option 2 - WIFI Cache
Occasionally information between your device and WIFI will cache. The fix for this seems to be
1. Forget wifi network
2. Power cycle the device
3. Reconnect the wifi
4. Open POS and resync.