Googlebot occasionally gets 403 when reading sitemap

#1
Hi,

Lately, I've been getting errors in Google Search Console that my sitemap couldn't be fetched due to an 403 error. Sitemap is live, so I went checking further.

When using https://websniffer.cc/ (GET, HTTP1.1, Googlebot) it also gave back an 403 error (see end of post). All other user agents besides Googlebot seem to be working fine. Also, the weird thing is that usually if I try to check the sitemap again with the same settings in Websniffer, it does give an 200 OK notification. So sometimes it works, sometimes it doesn't. But of course not helping for rankings.

I can't figure out what's causing it. I'm running Wordpress, Litespeed webserver and cache in combination with Quic.cloud DNS.

Do you perhaps know where I should start looking for fixes? Can't find a lot on Google. Thanks in advance.

The error the 403 provides is:

<!DOCTYPE html>
<html style="height:100%">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<title> 403 Forbidden
</title></head>
<body style="color: #444; margin:0;font: normal 14px/20px Arial, Helvetica, sans-serif; height:100%; background-color: #fff;">
<div style="height:auto; min-height:100%; "> <div style="text-align: center; width:800px; margin-left: -400px; position:absolute; top: 30%; left:50%;">
<h1 style="margin:0; font-size:150px; line-height:150px; font-weight:bold;">403</h1>
<h2 style="margin-top:20px;font-size: 30px;">Forbidden
</h2>
<p>Access to this resource on the server is denied!</p>
</div></div><div style="color:#f0f0f0; font-size:12px;margin:auto;padding:0px 30px 0px 30px;position:relative;clear:both;height:100px;margin-top:-101px;background-color:#474747;border-top: 1px solid rgba(0,0,0,0.15);box-shadow: 0 1px 0 rgba(255, 255, 255, 0.3) inset;">
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