I am sure there are tons of threads about the AI behavior and I tried to see if there was one similar to my experience but there are simply too many threads to wade through.
In what is now a 1v1 in a large multisystem game the AI are sending wave after wave of fleets from their home system to my system only to park the fleet at a gas giant a few jumps from the sun where I have a starbase. They then park themselves opposite the starbase and do not attack it. They simply allow the starbase's fighters and bombers to slowly destroy them, they do not respond to the presence of any of my fleets either, they simply sit and die.
Has anyone else encountered this? I am more than willing to provide more details if I did not explain myself properly. The AI difficulty is normal, and the AI does not send fleets anywhere else.