Facing the Sony screen, there is a cover on the back right side that pops off. There is a USB A plug there that goes to the connector on the dash.
1) Check that connection, it might be loose, or
2) Unplug that and plug your USB cable directly from your phone to the Sony, bypassing the connector on the dash.
I was having a lot of random disconnects when using Android Auto, and sometimes it wouldn't even work at all. On my last trip I plugged my phone directly into the Sony using my own cable and didn't have any problems with it at all.
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