Battery issue after iOS upgrade to 4.1

I have upgraded my iOS to release 4.1. After that my battery will be empty within a 4 or 5 hours. before the upgrade the battery works more than a day.
Another issue is to delete emails. If I delete some mails and wait a few seconds the mail will be received again. This happens with my Mobile Me account AND for my exchange account. Before the upgrade was made all works properly.
I have tried to reset the iPhone to factory settings and make a new configuration manually but the result is still the same.
Anyone has an idea what kind of issue I have?

1 & 2, common problems.
3 - check your settings
Apple fix the bugs?  Sooner or later. 
Good luck.
<Edited by Host>

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