Have you made any changes to the opener, such as installing new LED bulbs? Some can interfere with the signal. You could also install a longer antenna (simple wire) from the opener to a location outside to help signal reception.
Agree on the cam carrier. As Silverton posted, seems to be somewhat common. My 2018 started leaking at less than 25,000 miles, driver's side. Fixed under warranty. Been keeping an eye on it since. So far, no other leaks.
2018's are on the new high pressure system. R1234YF refrigerant. Little harder to find and generally much more expensive than 134A. You cannot mix them, and must use separate equipment that has not been in contact with the other type.
And the new stuff is flammable, albeit mildly.
Are you no longer under warranty?