Sounds like DOS (ProDOS?) is getting mangled.  The Mantra of "Save Early,
Save Often" can certainly be a blessing here.

As for pulling apart the //c, here's what I do (having done this about 8
times in the last week to fix up a bum system):
- Flip unit over.
- Remove the 4 screws directly under the keyboard.
- Remove the 2 screws at the back (by the handle).
- Remove the 4 disk drive screws also if you plan on taking the entire
thing apart.
- Flip upright again & look at the back of the box.
- Gently pry apart the top of the case from the bottom with your fingers
-- just a bit.
- When you can, pry off the BACK plate first, starting at the ends and
working towards the middle.
- Once the entire backplate is off, spin the unit around (so you face the
keyboard now), and pry up the rest of the case.  The front has a small
lip/clip on it, so you need to slide the cover away from you slightly
while you life the back.

This removes the cover.  If you removed the drive screws as well, you can
then lift up slightly on the keyboard & pull it towards you (gently, those
are some old cables) so that it disengages from the disk drive, then you
can flip the DD over towards the back of the unit to get IT out of the
way...
 Goldstar Software Inc.
 Building on Btrieve(R) for the Future(SM)
 Bill Bach
 BillBach@goldstarsoftware.com
 http://www.goldstarsoftware.com
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 Chicago: July 15-18, 2002 - See our web site for details!

Simon Williams wrote:

> Seems like the //c is getting a lot of airplay these days, so here's
> my two bits (should that be 8?)
>
> I've found that when I'm fiddling about in AppleSoft on my //c (can't
> remember which version, but the one that supports UniDisk,
> anyway...)...
>
> Uh, where was I ??? Yes, fiddling.
> After a while the //c starts to ignore my input. I'll be programming
> away, LIST the program and voila! The last n lines are missing. This
> is infuriating.
>
> So I type: SAVE MY.PROGRAM
> //c sez: SYNTAX ERROR
> I say: PR#6
> //c sez: SYNTAX ERROR etc... you see the pattern.
>
> Typically this ends with me turning off the computer and turning it
> back on after a minute or so, at which point the machine is acting
> like it never happened and everything is still fine between us...
>
> The computer is well ventillated and does not heat up appreciably... I
> tried to open it up the other day, but even after pulling all the
> screws the case would not yield (which is probably for the best, since
> that was as far as my plan went).
>
> Any thoughts?