I actually had something similar happen last night. My recorder froze up at 51 minutes into a show
The only way to get the thing to do anything was to open the battery door and take them out to reboot the device. So now I have an incomplete source as well as a file that won't open in editors. I'm not impressed....
I think I found a much easier way to do this, not sure if it will work for you guys but it did for me.
1) Open the WAV file that is giving you trouble in CDWave.
2) It will ask you if you want to adjust the size of the header. Click YES.
3) Then it will say it reports that the file header has a size of zero and do you want to continue. Click OK.
4) Make a track somewhere before the band starts, only save the second track, let it discard the first track.
5) The new file you created will now open properly in any editing program.
Like I said, this worked for me, and maybe not for you but I thought it would be worth trying.
Clint