We have 43K miles on our 2018 Countryman S ALL4 and the low tire pressure light comes on almost every month - starting 3-4 months ago. All 4 tires are low at the same time. Usually registering 27-30 lbs each... We fill each tire to 32 lbs and reset the warning light. Within a month they are low again... We purchased the car early in 2020 with approx 33K miles on it. This is the second set of tires on the car and they are Firestones, put on by the original owner. Any ideas what the root cause is for the consistent pressure loss across all 4 tires?