Android Auto unusable

I have a Google Pixel 2 XL and a Sony XAV-AX100. More often than not, when I connect the phone to the car, Android Auto is unusable. Everything is sooooo slow, that I have to reboot the phone. I can struggle to get Google Maps to work and if it does, it's often lagging behind so directions aren't accurate. Playing music through Google Play Music will work, eventually, but every few minutes, it will stop momentarily and then continue (much like a CD skipping). This happens to other audio apps such as Pocket Casts too. Once the phone has been rebooted, it works perfectly. I've removed all the apps I don't really need, as well as some that I found reported as bad for this online. Is there a way I can find out what is hogging the resources of my phone when I try to use Android Auto? I think the phone doesn't run as well at times of normal usage, but nothing like what I see in Android Auto. I have issues with the Sony XAV-AX100, which Sony are now refusing to resolve because my warranty expired, even though I reported these before it did!