Classic Editor will not allow updating post or posting images

I have several websites running the Classic Editor plugin. I recently noticed that in some cases, when I updated a page or added an image, the page was not updated and it would redirect over to the home page, or the image could not be added (it would be blank where the image would go after I would click “insert image”). Is this a bug in Classic editor or are there any known conflicts with other major WordPress plugins?

It is a great plugin and thank you in advance for any assistance.