So I recently jailbreakd my phone and have installapp and all that but periodically i will open a application and after i try to do anything it will close to the home screen. It usually does this until i either restart the phone or lock it and unlock it again. Right now i have

gpSPhone
Lights off
Sudoku
Glass Orb theme
Isnake
Pushr
Navizon GPS
Installer
Summerboard
Designer image sets for Custimize
Services
Custimize and
taskbar notifier

all installed on my iphone...is there any knows bugs or errors or any reason my phone does this. Its annoying...thanks