What device are you using? Does it happen to all the maps?
Sorry, I did not see your reply until now.
I was in touch with esri and at this point there is solution.
Great to hear you found the solution
Ayelet, I know this is an older question, but since you found a solution, it might help others to know what it was.
I'm curios if it was just an uninstall and reinstall the app. Seems apps seem to start crashing after a while on my iPad, and that typically repairs them (typically after a few updates had been applied to the app).
if not, it would help to know if it was an issue with you app, or something that might help others in the future. Thanks
I didn't see your reply until now. Sorry.
I can't remember what was the solution, but sometime after that Android OS was updated and the Collector doesn't work properly on my device anymore. esri are aware of this issue and they can't do much.
My advice, do not hit "ok" when your Android ask you to update the system.
I searched my emails and found this answer from esri support, I hope it will help.
Samsung Galaxy S5 Problems After Android 5.0 Lollipop Update and How To Fix Them [Part 30]
Read more at http://thedroidguy.com/2015/02/samsung-galaxy-s5-problems-android-5-0-lollipop-update-fix-part-30-10...
Thanks for the summary. I don't even have an Android device yet, but I'll bookmark the thread for the future, if needed.
Make sure to mark this questions as answered (with your summary) or "assumed answered" (near the title in the original post). This closes the thread so others know it was resolved....and the response that answers the question.