We have created a public survey to collect data out at sea, when offline - however some devices are getting stuck on 'getting service information' and do not send the survey when back online. Some iOS devices work and others don't. Most devices tested appear to work, however, we do not want advertise the survey to members of the public if some devices still don't work.
I have looked through some previous threads but haven't been able to solve the issue - I am fairly new to this so I may be missing something really simple.
Any help would be greatly appreciated.