Cant Edit Pages

I am having difficulty editing all of my pages. Up until a couple of weeks age, everything worked fine. I do not edit my pages frequently so I am not sure when this problem first occurred.

Now, when I select edit page either using the menu bar in the admin account, or select Pages/All Pages and then select edit under any page, I get the following error:

This site can’t be reached
The webpage at https://www.xxxxx\.com/wp-admin/post.php?post=916&action=edit might be temporarily down or it may have moved permanently to a new web address.
ERR_HTTP2_PROTOCOL_ERROR

If I deactivate all of my plugins except WooCommerce and Jet pack, I get the same result.

If I reactivate all of the plugins and deactivate just Jet Pack, I am able to edit the page, but there is no template while editing. After editing, I can reactivate Jetpack and all if fine. The edits took.

Recently I installed AMP, but have since deactivated and then removed that plugin.

Any ideas?`