My issue with the 2.3.5 update was pretty big and made my phone nearly un-usable: After the installation was completed, my phone would so a "soft" reboot every 60 seconds or so. The download was fine, the install was fine, I saw all of the usual messages, but after it was done, the screen would go blank and I'd hear both the Samsung and Verizon startup tunes. It would take at least 20 seconds to be usable again, then I had about 40 seconds to try to figure out the problem before it would reboot again.
Needless to say, this was extremely annoying and frustrating, but I eventually figured out that it's something that was stored on my MicroSD card. Once I removed the card, the phone ran a heckova-lot faster for just about everything. I was getting very frustrated with my phone before the update since it would freeze up for 10 seconds or so fairly frequently, take several attempts to unlock it using a simple unlock pattern, and have lots of "lag" in responding to taps and swipes.
I'm thinking now that it was all due to something on my card. I started by copying all content to my PC, formatting the card on the phone, then copying everything back, but as soon as I did, the problems all came back again, especially the rebooting. I'm now in the process of copying only select items back to the card, one-at-a-time, to narrow down the problem. My card wasn't full by any means, but it had a bunch of stuff on it, so this process is making me clear out the clutter. It's nice that the phone came with a 16GB MicroSD card, but it seems that the phone will slow to a crawl if I fill it even half full.
So for anybody having trouble after the update, try pulling your memory card and see if your phone's problems disappear too.
