Throwing in my hat on this as well, as I've also been experiencing these issues.

Platform: PC (Steam)
Wired/WiFi: Wired
Frequency: Most frequent I've had is every 10 mins, least frequent is every 2 hours. There is no consistency in the issue frequency as far as I can tell.
Character: I only have the one
Disconnect Location: Everywhere. I've had it happen in duties of all kinds, in pvp, in the overworld, in cosmic exploration, in occult crescent etc.
ISP: Dodo

Additionally, if a vpn is being used, it stops a full disconnect, but when the issues would occur it instead results in other connection issues (other characters stop moving, GCD stops rolling properly etc. - just today I had a Verraise cast continue to completion even whilst moving around which was bizarre to see).