Problems with 04 jetta?

[04Jetta]

I have had many problems as of late. My sterio somtimes doesn't play when it's cold outside? My electric door locks sometimes cycle up and
down for no reason at all? My fuel gauge seems to be a constant problem
with indicating the correct fuel level even after five trips to the dealer and sometimes it stays on empty for a day or so? Has any found a solution to these headaches? Thanks