50G resets after attempting Erase/Draw function with F'

[Skyblues]

Greetings,

I have run into a problem with my HP-50G that I was hoping someone may have a solution for. It happens on both my 50G and the emulator.

I am going through the HP-50g quick start guide; specifically the example on page 17.

Steps to reproduce:

1) Enter the equation 1/4 X^3 - X^2 + 1
2) Select Draw
3) Select Fcn -> F'
4) Select Cancel
5) Select Erase
6) Select Draw

The 50g resets by itself.
When I go back to where I enter an equation (LS hold / Y=) I am getting the following error:

Error:
No Current Equation

From this point, I am not able to return the Plotting functions/Equation Entry where I can Add an equation without getting that error.

On the emulator, I am able to reopen a saved *.e49 file.
On the real 50g, I have to restart using a paper clip and sometimes I have to do that numerous times.

Any suggestions on how to resolve this (besides don't do that again :-)

Thanks,
Jim