PVE 7 web Interface not accessible

I recently noticed that the web UI of PVE is not accessible temporarily and apparently arbitrarily (though consistently). Refreshing the browser after a while might bring it back. This is quite annoying and I tries Firefox, Safari and Chrome but they are all the same. I reinstalled PVE 7 but the problem remains. All VMs are running though (including PBS) and can be accessed via RDP or web.

The installation is a stand-alone server and all was fine until a few weeks ago.

Any help is much...

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