On several occasions I have down loaded the charts in the AIP. When planning the trip they are in the memory. After shutting down the iPad and restarting for the trip the AIP charts have disappeared. Have I some incorrect settings?

Hello,
more tests this morning. I'm working with the german AIP.
I begun working with the WIFI disabled.
If I try to get the EDFE plates (click on Airfield, Find Plates), the Plates sidebar opens with all the the plates shown with light green background.
If I then try to get the Oppenheim (EDGP, south west of EDFE) plates, the sidebar opens but only EDFE plates shown.
I then click Route - Start again, so that the sidebar is empty.
I then try again to get then EDGP plates, and get the message : "To use this function you must have an active connection......"
Keeping the Plates tab open I then activate WIFI and without any other action as soon as WIFI is connected, the EDGP plates appear in the tab, with the light green background,
If I click again Route - Start again,, the EDGP will always be present WIFI on or off.
But if with WIFI off I then try to get the EDEL(Langenlonsheim), west of EDGP, I can reproduce the same behavior.
I then updated the AIP and all the the fields I tested worked.
Hope this can help.
Regards
Pascal