You may also apply Google search on phrase like restore illustrator. And to see and to try what you find.
For example, I found out iPad Online Service - https://onlinefile.repair/en/illustrator.html
There are a few things that can be done to solve this. You can try turning off the cellular data and back on again, going to "reset" and resetting the network settings, and if those don't work, then you could try contacting your network operator.
If you charge your iPad and iPhone when you sleep, they automatically turn back on. Also, if you don't fully turn it off, a notification would turn on the screen.
