Hi,

As we are both not sure about what could be causing the issue. I decide to uninstall and remove everything and start from scratch. As I mentioned earlier I did not yet start the site customization; so I have no data to worry about.

I am attaching the videos down below, that shows what I have done :

1- De-activated the theme.
2- Uninstalled Word Press and removed everything.
3- Re-installed WP again.
4- Uploaded your Theme.
5- Activated the theme, installed the plugins, applied the patches, and imported the desired demo.

So far all looks ok till now. I will keep an eye on the performance and update you if the issue starts to happen again.