I've got an iP4 with 4.0.1 loaded and have been experiencing the following problems: 1. Occasional inability to 'slide to unlock' when trying to answer an incoming phone call (the slider moves a little bit but bounces/snaps back to the left) (didn't have this with OS 3.x) 2. Safari being unresponsive for seconds at a time (didn't have this with OS 3.x) 3. And most frequently...apps crashing immediately/soon after launching them (somewhat like was happening in early versions of OS 2) (didn't have this with OS 3.x) These issues were also present with 4.0.0 and are not fixed by rebooting or hard resetting. I wonder if it has something to do with memory management related to multi-tasking? Any thoughts/help appreciated.