iPhone Mail - Losing emails when moving to folders

i've had happen number of times, , can recreate problem.

have 4s running 5.0.1. using iphone's mail app access yahoo e-mail account.

if attempt move multiple emails inbox (more 5 or so) yahoo email folder, connecting symbol stay on very, long time. (i've watched stay in connecting state on 3 hours.) then, when checking destination folder, messages not there. nor in inbox. they're not in deleted folder, either. seem gone.

i'm new forum, i'm sorry if i'm asking in wrong place/way. have similar issue? ideas on how either recover lost e-mails or make sure doesn't happen? otherwise, i'm going have wait sort yahoo mail until desktop.

thanks!

 

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