It was a surprise for us that the 2.4Ghz fixed issue for one of our customers.
But we recommend using 5Ghz WIFI. You can try 2.4Ghz but if the issue still happened you need back to 5Ghz and we will do our best to investigate how to fix it. If 2.4Ghz helps you, please write us here.
The common issue here appears to be the Subaru head unit. I have a 2020 Forester that also was having intermittent connection issues. I downloaded the latest firmware (1.8) a few days ago and so far its much better. Still does take about 45 seconds to connect to AA. Phone is Pixel 5A, Android 12, Feb security patch applied.