2019 Q1: Denial of service on v2 and v3 onion service

Dear tor team, We have setup a discussion board, on the tor network. And there is someone that is exploiting within our servers, by taking it down it every time and the forums will respond with "Server not found". We are pretty sure this problem is on the side of the TOR browser, is there anything we could do to sort this? With many thanks for taking time into reading this.

Trac:
Username: pidgin