Hello,

my screen and radio do not seem to work. I reset by unplugging the battery and then everything came back to life. However, few hours later, everything no longer works again.

weird enough, in middle of my drive everything came back again. However, when I started the vehicle one more time, nothing worked again

Any suggestions?

I did notice the battery connections are loose. Can this be a problem?

 

If the connectors are loose it can cause a myriad of issues. I would start there first and get those tightened down.