One of the easiest ways to solve the disconnection error is by switching from a wireless connection to a wired connection. When you use WiFi, your internet signal can sometimes be unstable, which can cause errors like this. A wired connection (using an Ethernet cable) is more stable and can help reduce these types of issues.

If you’re using WiFi and seeing this error, try plugging in your console or PC directly to your router with an Ethernet cable. This should give you a more stable connection and may fix the problem.

Sometimes, this error pops up because of a temporary bug or glitch in the game. If that's the case, restarting the game can help clear up any small issues that might be causing the disconnection.

However, in some cases, a simple restart might not work and you need to perform a power cycle instead. For this, turn off your PC or console and remove the power cables. Then, wait for around four minutes and plug everything back in. Try playing the game again to see if that fixes the problem.

Another reason you might be seeing this error is that too many people are trying to play at the same time. Since Path of Exile 2 has just launched, it's normal for there to be a lot of players trying to queue in all at once. This can cause the servers to become overloaded, which leads to errors like “An unexpected disconnection occurred.”

If you think this might be the cause, all you need to do is wait a little bit. The servers should become less crowded after a while, and the error will stop appearing. You can try logging in again after waiting for 15-30 minutes.