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TeXstudio was related to Texmaker in the beginning a long time ago, but it's very different since many years now, so you could give it a chance.
Thank you very much for the information. I have now installed TeXstudio 4.0.0, and it does not seem to suffer from the problem. This is why I accept your ...

Maybe it would help to reset the (user) settings. The first entry in the last submenu in the options menu can be used for this. It may be also a good idea to delete the whole user directory of texmakers with all the user setting and user auto completion files. But I do not know, where windows users ...

I'm no Texmaker user, but what happens when you type the closing brace first? Or try to insert a pair of braces with copy/paste?

Thank you very much for the question. Copy/Paste seems to work. Typing the closing brace first seems to depend on the context. It seems to work in an isolated context ...

I am using Texmaker (Version: 5.1.2, with a recent version of MiKTeX and Windows 10) to edit a large LaTeX file (about 15000 lines/600 KB). The problem is that Texmaker crashes (completely/without any feedback) as soon as I type an opening brace.

The Windows Event Log provides the following ...