Nokia 6682 / 6681

Is anyone experiencing wierd issues with the email app that is bundled? I set up a mailbox for my GMail acct, but the messages disappear (haven't noticed yet how soon, but fairly quickly) from the phone. I tried resetting them to unread on GMail, but the phone wouldn't pull them back down.

I maybe should just buy a better app, but was just curious if anyone else was experiencing similar probs.