[3G][2.1]White Screen?

Ok.. so a few days ago I was needing my address (I just moved) so I opened the notes, wrote it down and relocked it (no going to the SB or anything)

next day I pocket my phone, drive to school and put in my headphones. Unlock it and try to go to the home screen. I double press home and it brings up my favorites. I press the play/pause thing on the headphones and music starts. Also if I pessed home it brought up an ipod display that had Next/Last tracks Play/pause, the track name a close buttona nd an ipod button. Pressing ipod took me to my ipod app and pressing close did nothing but leave me where I was.

So I tried to take a screenshot, screen flashed white and stayed white. Locked the screen and turned back on, was still white. Not even a slide to unlock, but if I swiped my finger where it SHOULD have been I heard the unlock "click".

I did a hard reset (HOME+Power for a while) and it booted normally and it works fine now, thing I'm asking - should I be alarmed? Do you think this is a one time fluke, or will it happen again?

iPhone Stuff:
Model: 3G
Firmware: 2.1

Apps(in the order I see them :P)
Pandora
Super Monkey Ball
Tap Tap Revenge
Jibo Break
de Blob
Phonesaber
Enigmo
NetNewsWire
Bubbles
snes4iPhone
gpSPhone
NES
MySpace
Facebook
Bossprefs
TipTap
Poof
Installer
Cydia
AppFlow
Customize
WInterboard
Flashlight(cydia one, not appstore)
Shazam
iPint
iScopes
IGN Reviews
iNetworkest
Movies.App
Currency
AIM
FPLite
LOLCats
genesis4iphone
backgrounder

had this same problem, it's reoccuring they replaced my phone instantly

I've got the same thing happening. I had it happen on my 2g a while back and have not had it on my 3g yet but it's happening now. I managed to get past this by entering DFU mode last time. I forget how to do it now but googling it should find an answer. I'm gonna try now.

It happened to me once. Well, not exactly the same thing, but I had the screen Stuck at a page.

Nothing to be alarmed about.

If it keeps happening again and again, just Restore your phone. if it happens even after the Restore, you may want to RMA the phone.