Mail app have problems with “side menu”(copy/paste etc.)

Hello

I have problems using the side menu for “copy/paste” in replying to an email with the iOS 11 native mails app, when I try to press the screeb for the menu to pop-up, it flicks for a second and then disappears.

2 solutions that I found but are no help for me is to change the phone language for Hebrew to English and to restore the phone to factory settings, and the problem was solved, but when I restore to the last backup with all the info, the problem returns. I’ve deleted a lot of junk apps to see if there’s a clash, but it did nothing

Hope for a quick solution

Thanks

Lior