NonBostig PSA for all the Razer Nari Ultimate owners that have failed dongles that cause sudden disconnects or won't allow connection at all. This is a very common issue. You can reflow with a reflow station, or with an oven, definitely check out other videos on how to reflow in a home oven.

You're repairing poor solder joints on the mainboard, which is the source of the problems. You can also buy replacement dongles on Aliexpress apparently, but why not give the reflow a shot.