Trunk latch is popping back open once closed...takes about 5 seconds...What Can I do to fix this issue?

Chances are the striker is now bent from slamming the trunk with the latch latched. My suggestion is take the car to a competent body shop. They might charge a little for fixing it, but wont do further damage.

You need to replace the Latch assembly part thats located inside the trunk

Thanks

find a shop to fix it;.

Try to trace the release cable to the lock latch and see if the cable fully extends. A little WD 40 may help.

make sure inside trunk release in trunk is not stuck in open position also try pulling on to try to release it

yes that could be the problem. try this putt your key in to the lock and turn it to unlock it , check to see if latch is open ,while still holding the key in the unlock position close the trunk and relock it with the key while pushing down on the hood at the same time. replace the lock when you can .there is no quick fix for this unless u use a bungee cord for it .

So your trunk release button on the dash dpesn't seem to open the trunk.
Does your key fob button open the trunk? yes....then could be problem with switch but read on.
no......are your power door locks not working as well. not working.....check
fuse, on 2001 Focus the fuse is a 20amp number 63 on the back of the fuse panel under the dash. Pop cover off and undue the rwo screws. hold plastic retainers and pull off the fuse panel from metal frame. pull fuse panel down toand turn over so you can see the fuse.check fuse. blown? yes.......replace fuse with good one. test all door locks open/close then check fuse...if its blown the problem is something to do with the door lock circuits. if the fuse is still ok...try pushing the trunk open button. fuse still ok? then I am a loss toas to whats the problem but if the fiuse blew when trying the trunk button your problem is the trunk latch circuit.
Now if the trunk latch button is popping the fuse then disconnect wiring to
trunk latch (in trunk) and try the button again. Still blowing the it is the electrical before the trunk latch unit. If it did now blow the problem is something to do with the part of the circuit you disconnected.
How to go farther and find the problem exactly is not covered in this answer. You have to take it from here. JAG

I did this to my car once. Be sure the latch isn't closed as you are trying to close the trunk. With the trunk open pop the trunk once, then see if the trunk latches properly.

there is a little finger in the latch that closes when the trunk is closed chances are that the little finger has closed but the trunk is still open... this can be fixed by looking at the latch on the lid you will see a slot with a metal arm in the middle take a screw driver and place it in the hole in the slot at the top. press the button on the fob to open the trunk while your pulling down on the screw driver the little latch should twist letting the screw driver move through the track and pop out now alowing you to close the trunk and being happy again.

With the trunk open try putting the key in and turning so that the latch swings open. This may be the problem. The latch may be stuck closed. with the key turned make sure the latch is open if it is not then take a scrwedriver and pry on the latch with the key turned to open it. Then try to close the trunk. I hope this helps. Don't forget to rate my answer. thanks.