Try getting evidence together with something like winMTR that will log the activity over a duration so you can track the trends in your connection. You can use this information to report it directly to SE, your ISP or even identify issues on your own end (i.e. you see packet loss or high latency directly from your router or external IP).
Instructions here:
Tracking packet loss with WinMTR
This has helped me in other online games as well.
Best of luck.