So... Exactly 3 months after I started using a new key, the issue is slowly starting again. Happened on August 4th while I was downshifting to slow down (car ran a light close to me, so I was forced to slow down), and again today when I went half throttle on 2nd gear.
I’ll have to wait till next week, but I’ll be taking it to the dealer to have them scan it and see if they find something.
Again, using a different key made a difference since it went 3 full months without the issue happening. Still, no CEL and no indication that it’s going to happen. I just hope the Subaru diagnostic Tool will tell me something.
I’ll update again after I visit the dealer.