Hello
I'm having a problem because I have a part that I made a few months ago and today when I want to modify it, it makes me crash SW.
I tried to make a copy of it, erase the sketch etc. but nothing helps, always the same problem.
The only solution I currently have is to recreate on top of it.
Do you have a solution or a technique that would allow me to modify the part?
Thank you in advance for your help.
Hello @KhAmCoM
You can post your file so that we can take a closer look at it.
I didn't understand recreating on top of it (does that mean that you create new sketches while forcing yourself not to touch the old ones?)
In the meantime, tell us what you have changed:
Anyway, tell us a little more 
Kind regards
Luer.SLDPRT (427.0 KB)
Here is my piece.
I'm on SW 2020 on PC, individual post. and no use of PDM.
For example, on this piece, I want to modify my sweeps to make them bigger.
when I try to modify the sketches, SW crashes.
So I'm forced to recreate the sketches in order to recreate a new scan.
I don't know if I'm making myself understood 
Is that clear!
I look at the file and I get back to you
Kind regards
Hello,
I tested your part at home and tried to modify the first scan
And I actually also have a crash.
I think it's during the reconstruction I'm going to do another test
Zozo may have found the solution before me 
Indeed it crashes as soon as the sketch of the first scan changes.
This indicates that it's coming exclusively from your file.
Like corrupted file which happens from time to time.
I see only one solution: save it in neutral format (parasolid), make a minor change and then save it in SW format.
I haven't tried: I'll let you test it and let us know if it solves the PB
Kind regards
PS: I hope you have the PB only on this piece 
Hello
I'm in solidworks 2020 SP5 and I also have the crash when I try to edit the first scan directly.
By going up the "blue" bar of in the build tree under the first scan, I manage to modify the sweep but when I go back down the bar, solidworks crashes.
As Zozo_mp says, it appears to be a corrupted file.
By lowering the "blue" bar function by function, I crash at leave 29.
So I tested again,
If you want to modify you have to pass the blue bar as mentioned by Rim-b at the level of the swipe you want to modify, as mentioned also there is the leave 29 which blocks according to the modification because of an order that does not find
So maybe try by moving this blue bar to edit
Then you go through each sweep by rebuilding, by doing this on my side it didn't crash anymore
I think its must come in the end that if solidworks has to calculate too many elements it crashes, so it can be calculated step by step
I'm attaching the example to you
Luer_modif. SLDPRT (313.8 KB)
Thank you so much to all!!
I'll do as explained by Rim-b.