CLK 350 2007 The radio and sound come on when I start the car. After a couple minutes all the sound is gone for the radio GPS everything. It looks as if they're running there's just no sound

did you press and hold in the clk button until the hour starts flashing ?
did you use the up arrow or down arrow on the radio to adjust the time
or the seek button the right and left arrow buttons
press CLK to jump to minutes
https://www.fordservicecontent.com/Ford_Content/catalog/owner_guides/10f12og3e.pdf
page 42

I agree that the fuel relay is likely the problem.

Sometimes there is a mute function and some cars have a telephone button which mutes the system. Now there are passCodes for radios with Satellite. The radio is "locked" until the driver subscibes to a Satellite provider, just like Direct TV. An account must be paid for to get Premium service. Your radio must be set to a Non-Premium channel to work.

This is a small item to correct and you should return to the Seller for advice, especially if it was a car lot.

I hope my solution was useful.

sounds like your starter could be heating up on you, check to see if any exhuast pipe runs close to the starter, and see if the starter has a shield protecting it from heat.

Setting the time:
Hour: Press and hold the CLK button and at the same time push the SEEK button < decrease the hours > increase the hours.
Minutes: Press and hold the CLK button and at the same time push the TUNE button < to decrease the minutes > increase the minutes.

Station Pre Set:
You can save 4 pre sets on this radio (1-4) tune the radio to the station you want to save then PUSH and HOLD one of the pre set butons until the sound returns, the station is saved to that pre set. Repeat for the 3 presets.

Clock:
Hour: Push and hold the CLK button and at the same time push the SEEK button to adjust. < decrease hours > increase hours.
Minute: Push and hold the CLK button and at the same time push the TUNE button the adjust. < decrease minutes > increase minutes.

off memory?????????????? when radio is on hold clk button in, afer a few seconds hrs will flash I think you use the up-down button, then when the hrs are right press the clk button again and set the minutes, when done push the clk button and it should be the time you put in.

it may sound like you have a faulty batterie. it could be a short cut inside it that come and goes. Try another battry. Good luck!

look at antenna wires make sure every thing is in contact.if all is good.sound like problems in the sound amplifier.in radio.