4.2.1 locking up...should I restore?

I have the same thing happening to me. I close almost everything constantly with the exception of the iPod Player (since I'm almost always listening to audio books.) I can usually tell when it is about to lock up when I either start biteSMS or the Email app and they both attempt to load and then disappear. At that point I usually head off the lockup by bringing down SBSettings and doing a reboot.

In comparing your list with mine, you have a lot more cydia apps installed then I do... and I have a few you don't... I'll list what we have in common first:

Activator
SBSettings - Airplane Toggle
AppStore Update Size
Autolock SBSettings
BigBoss Icon Set
biteSMS
Cydia Installer (1.1.1 or whatever the new one is)
Cydia Translations
Five Icon Dock
IntelliStatusBarIcons
libdisplaystack
LibWeather
Lockinfo
Repo Icons
Safari DL Plugin
Saurik Source
SBSettings
sbsettingstoggles

Apart from that I have additional packages:
animate
AppSync for iOS 4.x+
AppSync for iOS 4.2
attachment= for mailto:
Chronus
CyDelete
Cyntact
EZDecline
FakeClockUp
Fast Copy
iBlacklist
iCallAnnounce
Iconoclasm
Iconoclasm Layouts
Installous 4
Lockinfo Weather Plugin
Multifl0w
PreferenceLoader
Recent/CallLog Delete
SBSettings Tethering Toggle
TetherMe
TetherMe APN Editing
TetherMe Preferences
USB Drive
5-Row Keyboard iOS4


I was suspecting Lockinfo since it was updated recently and was also starting to think FakeClock could be my culprit.... I might have to start with what we have in common though and you're not running FakeClock.... I did notice that when I enable RAM and DATE to be displayed on the statusbar in SBSettings, it seemed I locked up a lot quicker... I might start with SBSettings and all the add-ons for it and see what happens..... I'll let you know..... I really don't want to start over again with another load of JB 4.2.1....

 

Same here. I've gotten really used to having Lockinfo in place.
I did want to mention one thing.... When Cydia upgraded itself it sort of hung at the end... like it had completed but couldn't generate the "Respring" or "Reboot Phone" (or whatever) button and I chalked it up to Cydia upgrading itself.... once I rebooted the phone, everything seemed ok but Cydia was giving me some weirdness on an upgrade of "libstatusbar" like the source wasn't available..... yesterday, libstatusbar finally updated w/o error (I updated biteSMS too) and no lockups as of yet..... I'll keep updating....

UPDATE: Just locked up tight again.... right after receiving a voicemail notification..... BTW, I'm also using Bluetooth (stereo headset only - not data transfer or sync) - just thought I'd throw that out there.

Another UPDATE: After rebooting using SBSettings I attempted to load the iPod player and poof! HUNG AGAIN! This time I performed a power off using SBSettings. After booting back up things look ok for now.... I think I'll take off SBSettings the next time it hangs....

 

funny you should ask.... I'm on an office network with heavy proxying and filtering and as such I can't use Greenpois0n. Redsn0w wasn't an option as I avoid tethered JB's like the plague. I ended up having to use Sn0wbreeze 2.2.1 since it is all inclusive and doesn't need network access though I had to download it through my phone using the download manager for safari and transfer it to my PC using iFunBox.... a pita but it worked. I've heard of many issues with sn0wbreeze but everything worked for me and I have the ipsw's it generated ready for reload if/when I decide/need to. I absolutely HAD to get to 4.2.1 to fix the bluetooth problems apple took their sweet time fixing (mainly AVRCP).... and for now see no need to go to 4.3.1 until I see the fallout from the first round of JB attempts.... I'm starting to think my cydia update weirdness might be my culprit.... and it could also be the theme I'm running (Black UPS Darkness)..... if it's cydia weirdness then a reload/cleanout is my only real option at this point.....

Update: Just thought I'd throw out that I have never had my phone just reboot on its own... it's always a hang/lock up.

Weekend Update:
No Lockups all weekend.

 

Our situation is basically the exact same.

Heres what I have (this is all the crap i remember off by heart, everything here is essential to me):

bite sms
dimmer
fastsnap
folderenhancer
iFile
Key logger
landscape lock rotation
lockscreen clock hide
mark dead
MyWi
Passcode lock prevent
Safari download manager
SBSett
SBSwitcher
Serious SBSettings HD
SpringFlash
SpringFlash SBSettings
SynTones
Winterboard

(NOTE: things that are auto-installed are not mentioned, like Activator)
I found my iPhone 4 locking up about 3x a day, mostly when I use the appswitcher and Cydia.. I didnt bother finding out what caused it because I didnt download anything recent except for the regular package updates..

Anyway, I have been trying to restore back to 4.2.1 and its not working, at all.. I tried Redsnow, tiny umbrella + itunes, itunes + hosts fix etc etc, everything was done in correct form (90% sure, I read like 400 pages on how to do each method and copied them over and over)..

Im currently going to try using a custom firmware and put my phone into 'pwnd dfu' and restore via iTunes with the custom firmware, see what happens..

If everything fails, im going to update to 4.3.1 and jailbreak. UGH I wish this type of thing was easier.. You would think that by now the whole 'downgrading from unsigned software' would be more consistent and stable.

PS: For those who are using 4.3.1, are there any compatibility issues with Cydia and extensions???

Please let me know of any issues!