I have the same problem but i don't have Dataplan installed on mine? I must be honest it doesn't bother me that much as it starts working again for no reason? I can see why it annoys ppl. When i put mine on charge the orange doesnt work, instead i get a really dim white flash?? Power on flash doesnt work but all other notification does. Really wierd? I just leave it n it starts to work again. Heres my installed apps...

3g/2g/duel mode selection app
anglemeter
angry birds
bounce
camkeyd
datetoday home widget
drnoksnes
extra decoders support
fapn
fmms
forca installer
forca widget
ioquake
ogg support
open arena
petrovich
picodrive
qtirecco (which i'm having big problems with btw)
rootsh
sharing plugin for fmms
speedometer
systeminfowidget
transmission
vncviewer
toutube video uploader

If i can remember i had this led problem quite early on before i installed any apps so i'm sure its nothing to do with what i've done?
Anyhoo, it works fine 90% of the time and its such a small problem that i can live with it.