Is the Mobile Forms app crashing? It is difficult for us to test every scenario internally, so we've added a diagnostic log which can help our engineers troubleshoot the likely cause of a crash. This is available on our 1.25 release and later.
You need to turn on the diagnostic logging, which is off by default (logging causes a slight performance degradation and increased network traffic, so best to leave it off unless you are having stability issues).
Please go to your Forms app and locate the settings icon:
Then, turn on diagnostic logging:
If you encounter a crash, please let us know on firstname.lastname@example.org as soon as possible so we can check our logs and troubleshoot the issue.