Random reboots during phone calls after upgrading to OS4

My 3GS is rebooting without warning in the middle of calls after the upgrade - never did this before. This has happened at least five times today without any pattern: one 50-minute call was fine but other shorter ones have been cut off without warning. Battery is fine. It's been doing this ever since I upgraded last week.
Also I have noticed the whole phone has slowed down dramatically, presumably due to multitasking loading up the CPU?

Try doing a restore.
Also I have noticed the whole phone has slowed down dramatically, presumably due to multitasking loading up the CPU?
Yes.
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