I have a WP8 alarm clock app with speech reco support. It runs fine on my Lumia 520 and at least 2 other people's phones who tried it out for me, one of them on a Lumia 920. However I am getting bad reviews from people and I think today I found out why. I submitted the app to the Windows Phone Parent category. They told me that they can't include the app yet because it gets stuck on the splash screen and never does anything else. They tried to run it on a Lumia 820 & 920. This may indicate that it's not actually crashing, as in generating an Exception, because I have the Telerik RadDiagnostics control embedded in the app and it never pops up.
Has anybody encountered a problem like this with their apps? If so, how did you debug it when it only happens on some people's phones and not yours?