If your app is crashing, do send us an in-app email via Settings->Support option explaining the issue / sequence of the crash a bit more in detail so we can identify & fix it with the help of your device diagnostics in coming updates.
Also, try restarting your device once. If the issue still persists, kindly share the issue notebook with us in its native format so we can test it out here (provided it is not confidential in nature).
If the notebook is too large, you can upload it to your online drive account and share it to noteshelf[at]fluidtouch.biz. Thank you!