Why did my girlfrind all of a sudden start telling me to go away? We were having a normal conversation (over text) and we were talking about a game that we both play, this has been happening randomly

Maybe you said something wrong, or she was feeling upset before, speaking to her about how she feels is a good think to do as it can help you understand how she feels and maybe make her feel more understood

It's a bit hard to understand the situation based on only this information, but boundaries do not indicate an unhealthy relationship, even if these boundaries were not expressed or existent before. That being said, it is for certain that you have the right to clear communication. Tell her that the suddenness and randomness is bothering you, and ask if anything happened or changed that makes her this way. She shouldn't dismiss your concerns, though she may still keep her boundaries. If you're unsatisfied, you can propose some sort of compromise. For example, if she dislikes texting for more than 30 minutes, you can ask if she wants to have video call on afterward instead.

It must be very confusing for you that your girlfriend has all of a sudden started telling you to go away, would you be able to tell me more about the conversation you were having when this happened? Does this only happen during conversations through text? How often has this been happening for? Have you ever told her that you notice she's telling you to randomly go away or ask why she is doing it? How long have you been in a relationship? You said that there is a game you both play, what else do you like to do together?