Galaxy S always hard reset problem!!

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http://androidforums.com – I have a Galaxy S i-9003 (singapore version) and a few days ago, i officially upgraded my phone from v2.2 FROYO to 2.3.5 GINGERBREAD via kies software now my problem is that when i keep it for charging overnight, i wake up in the morning only to see that my phone has undergone a factory reset process where ALL of my data gats deleted and that to this happens every day!! why is this happening? please help... can downgrading help??? this never happened in froyo... is it possible to downgrade my phone back to froyo???? (General)