Upon further testing I think I have found a more specific issue. I think it is only skills/spells that have a cast time that are causing the 90002 error.

This does happen in the open world as well as instances.

This started happening about June 26th. I don't remember having any updates to anything that might have affected the game.

Upon further testing I think that whenever I use skills or spells with instant cast times i do not have any issues at all, such as playing warrior or using the instant cast spells for summoner. The issues seems to only occur when i use skills that have cast times such as Ruin III or Miasma III. It usually takes about the same number of consecutive casts to cause this issue. Just as an example I can get just about 8 uses of Ruin III before the game disconnects me with a 90002 error.

I have tried resetting my router and my computer as well as trying to reinstall the game once that I have mentioned in the first post. I have also tried turning the graphics down but this did not seem to help at all.