Tara on "Help needed: Widgets keep going wrong/disappear!"

Hi, WordPressers!

I'm still a rookie to WP, and also definitely not an expert in coding. So, pardon me if the question I'm asking following isn't really an issue to you. Thanks for understanding.

Recently I found my WIDGETS often go wrong or disappeared automatically. By that, I meant widgets can go empty with "NO ONE CHANGES THE SETTING"(I'm the only one who has the access).

It's really been a pain in eye because I have to redo all drag and drop over again and agin to make the site looks like exact as how it was before. What a waste on time!!

The 2 questions I'm gonna ask are:

• Why/What can be the reason for this situation?
• Any method to lock present status of widgets to avoid this situation happens again?

Anyone with any possible reason will be great(even that may not be a solution) and useful. Thanks for your time and feel free to speak out.

Have you tried:
- deactivating ALL (yes all) plugins temporarily to see if this resolves the problem (plugin functions can interfere). If this works, re-activate them individually (one-by-one) to find the problematic plugin(s).
- resetting the plugins folder by FTP. Sometimes, an apparently inactive plugin can still cause problems.
- switching to the unedited default Theme (Twenty Sixteen, etc.) for a moment using the WP dashboard to rule out any theme-specific issue (theme functions can interfere like plugins).