Thank you for the reply Rune_Crystalblade.

It looks like you missed a few questions that I asked initially:

Have you experienced any other connection issues (i.e. lag) since you started experiencing this?
When you log back in, where does it put you? The instance or the open world?

Additionally, try making an exception for the game on your anti-virus/firewall. This could be blocking you from transitioning back to your previous location.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!