ahmett
Prominent member
You guess correctly.
You can buy a replacement hinge here for £8.99. Replacement involves removing the door card - there's a guide on this forum, here. It's more awkward than difficult.
If you're unable to fix it yourself, an independent garage should be able to do it for about £50 all in, including the part.
A franchised dealer will likely charge you a lot more than that.
The handle falls off because the hinge isn't lubricated and water running into the handle corrodes it. The hinge then seizes up and snaps when you operate the handle. For those whose hinges have not yet failed, removing the door card and greasing the hinge will likely prevent this, but as the part only costs £8.99 there seems little real merit in doing that much work. Another option is to squirt a spray silicone lubricant in the direction of the hinge from the outside (please don't use WD40); this should prolong its life.
IMO it's stuff like this that will ultimately be FIAT's undoing. This issue has been known about for ages and AFAIK the cars are still leaving the factory with hinges that are almost certainly doomed to fail at some time during the lifetime of the car.
Jrkitching I use wd 40 do to the hinge lubrication from the outside. Why shouldn't I do this?