Semi regular slowdowns

RouterOS Wireless Networking
1

As per this ping:

https://gist.github.com/dabeeeenster/e86763b39a34aa1f986d8cffe73d5e4b

I’m sat next to the router, hAP ac lite, on 5Ghz channel.

I see these slowdowns intermittently - between every 30 seconds and 2 minutes. Does anyone know how I can identify and fix?

Thanks very much,
Ben