wm6.5 device lock not unlocking?

[strra]

this has only happened to me once, but i want some ideas for the future if it happens again.

my phone is locked, i try to unlock it (put in my password and press the unlock lock button) and nothing happens. it acts like i didn't press the unlock button. i also tried pressing the contacts and email buttons, all to no avail.

i tried to call myself and unlock like that. nothing.

i tried to send myself a text message and slide the text button to unlock. nope.

i finally ended up hard resetting because i had no way of accessing my phone (losing some texts in the process).
so does anyone have any idea about this issue?
(using NFSFAN's 111, btw)