Adaptive Cruise Control problems of the 2015 Subaru Legacy

I am the original owner of the vehicle in question. I have been experiencing excessive electrical drain issues throughout the life of my vehicle. I have had to jump it at least 10 times and have replaced the battery 4 times throughout my 7 years of ownership. This is quite excessive and has caused safety issues in the past as you never know when the battery suddenly no longer has enough power to start the vehicle. My fiancé was recently on a ferry and upon landing the vehicle would not start and this caused quite an issue with the ferry operator and resulted in undue stress and anxiety on her. I have also always had an issue with the adaptive cruise control system (eyesight) in which under what I believe are specific circumstances, the system fails to detect the roadway and road markers in front of the vehicle and abruptly shuts off. This hasn't been a major issue as I am still actively driving the vehicle, but when you are driving 50mph on a highway and suddenly you are decelerating without brake lights indicating so to others around you can cause a sense of alarm. The somewhat specific situations this occurs in is when there is very little to no ambient light on the road. Although my headlights are on, they don't seem to provide enough light for the system to 'see' at all times.

1) spontaneous cracks in windshield originating from deicer while car parked overnight 12/3/20 taken to Subaru 12/4/20. Subaru website search showed models with all weather package from my production date had defect in windshield cracking from deicer area & warranty extended 5 yrs which expired 4/20 Subaru may not cover $1000+ cost which involves recalibrating & testing eyesight after replacing windshield (2) eyesight frequently disabled from lights of oncoming vehicles at night or in inclement weather & all safety warnings, emergency braking, adaptive cruise control etc are disabled at time critically needed for driving at night and/or in inclement weather. Paid $400+ for tech to try to duplicate/diagnose problem with front eyesight camera with no solution & now problem is occurring regularly.