My IPhone 4 is buggy after I upgraded to 4.3.5

Since upgrading to 4.3.5 programs crash frequently; text messaging back button now seems to take-off on it’s own deleting everything I just wrote; if I accidentialy tap the screen the apps immediately go into “delete” mode and the the top of the screen is cut half off.  I see the bottom half of the AT&T logo, the time, battery percentage; etc.
Can I go back to the previous version?  Is anyone else experiencing these problems?

I have had apps start with a blank screen the go back to the home page. Very sluggish performance (eg it takes mail and app store ages to load) also my iphone 3GS is no longer recognised by itunes

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