Sudden Spike in query requests killed server

Hi, we are running a TIG system and version of InfluxDB is OSS 2.0.4 and have an odd situation with InfluxDB, randomly there are thousands of requests sent 20k plus and this crashes the server due to it cleaning out the server of memory.

I cant seem to find where the issue is coming from as it only seems to happen every now and again. see pic below, when it does happen its within a very short time. has anyone else had this happen?