Ok There are two or three types of GFCI for this post.
One has Genuine screw terminals I have one of those to my right (KITCH-2 Circuit an added kitchen circuit) Others have wire leads... The one Damon put in at the factory behind me.. others have special "Snap on" connectors (you get a matching connector and it has wire leads)
Now a 12 or 14 ga wire properly bent around the screw and then tightened down.. Usually lasts a long. long time.. But in my RV I found several loose screws in the electrical system (not the outlets. they don't have any, but the breaker box) So I won't say the installer properly tightened.
I've had wire nutted wire to wire connections FAIL.. 2 of them or 3 (forget which) as well.
Finally we have the Uni-Box/Quick-box outlets.. Not really up to the kind of loads we often place on the kitchen, can MELT internally and loose contact. Have had one overheat. and seen one that melted the wire and dang near caused a fire.
Check all outlets on the GFCI chain, working or not. Starting with the GFCI Load connections.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times