No need for help in this case, just wanted to point out that if you leave D5 open for several hours (for example, you leave the file open and come back the next day), when you save it, it crashes.
Hi there, is it a heavy file? is this persistent in other files as well, or is it file-specific? If it is possible, perhaps a screenshot of the file (preview) would give us a vivid description of such an issue. Nevertheless, Thank you so much for sharing your findings regarding this matter. We will investigate this issue further and try to replicate the environment where the crash occurred otherwise, we will need you to send the sample file if it’s okay. 
Thank you for the response, until now this happens in any file, even if it is an empty one.
I believe you could simulate this, just open a D5 file, even a new one, leave it open overnigth and comeback the next day and try to save it. It will auto-close.
Hi, thanks for pointing it out. Was the computer left in sleep mode or hibernating mode? Perhaps this can be adjusted in the power settings since when idle, various power saver settings kick in, and one of those could be causing the crash.
Nope, no hibernation mode and no sleep mode… Ill try to simulate this and see if I understand what the issue is, Il let you know if I find anything out.
Hi thank you so much for updating us regarding this issue~