Hey Junkflap,
Thanks for getting in touch!
From what we can see in this screenshot - this pattern looks *fairly* reminiscent of bandwidth saturation (
https://www.pingplotter.com/fix-your-network/common-network-problems/#bandwidthsat) - but it's honestly tough to tell for certain with the limited view we have.
If you'd like, feel free to send over some of your results (via the "File" -> "Share" option in PingPlotter), along with a description of your issue, and we'd be happy to offer any guidance we can from there!
Best wishes,
-Gary