Bad Request Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit

Since yesterday I have trouble opening events in MeetUp.com. No problem opening the website, but when I want to open an event I get this error. Same problem with Shields down. I am able to create a new event, but cannot access it after it is made. Log out and in again makes no difference. No problem in another browser or on phone, but I want to use Brave, no such problem in the last 2 years and very satisfied and confident with Brave.
Details:
4 Trackers & ads
https://a.pub.network/meetup-com/pubfig.min.js
https://events.launchdarkly.com
/events/diagnostic/597ba6556040390cd07bbc8e
https://www.googletagmanager.com/gtm.js?id=GTM-T2LNGD

Is there a solution for this error?

I don’t know what happened, but it works again, even with the shields on.

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