Start an MTR to your world's lobby ( which is 204.2.229.11 for Bryn) and then when the DC happens the faulty equipment will be highlighted.
You can also tracert 204.2.229.11 when it happens, but that likely won't catch transitory errors like MTR will. (MTR is a looping version of tracert that runs in the background looking for internet problems)
Also please be aware Starlink is very susceptible to weather (including some types of clouds) and other events between you and the satellite. Expect a lot of ramdom drops in general when playing FF on satellite, it seems to be a game that is lot more sensitive to packet loss than some other games. Meaning other games work, but FF drops all the time on satellite. There won't be a solution to this apart from moving off satellite when it's not sunny outside, or possibly using a TCP based VPN to add a little error correction (at the expense of lag)
However, the MTR will show it very clearly, as it does record lost packets and other such problems. Bad numbers in the Starlink part of your route will point the finger there, bad numbers in the NTT portion point the finger to SE.
https://www.reddit.com/r/Starlink/co...ming_starlink/
https://www.reddit.com/r/Starlink/co...g_on_starlink/
And from this page
https://speedify.com/blog/how-to/avo...ection-issues/