Sorry for re-awakening an old thread.So I have seen massive improvement with 36.2.1
I now have lte reception before I even leave my underground garage. It’s a small sample size of a few days but it had never worked before like this.
I got the 2019.36 update and the car has not had issues with limited connectivity after I start it.
However, I still struggle with waking the car with the app, even more so now than before. I have to try to wake it for at least 5 minutes in the morning, and I give up on waking it during daytime.
I walked in to the Tesla service center, and the technician just pointed at the LTE bars and said "you have reception". I tried to explain that it happens when the car is left alone for a while, but they didn't want to listen to me. Got it back the day after "no issues found"
Ironic that I couldn't wake it with my phone when I picked it up, but the only thing they said is "we don't have support for the phone app", and told me that I could schedule another service.