My bet would be a connector in the hinge. They get a lot of wear and are rather sensitive to damage.
It might be just loose (something you could fix on your own) or worn down (not so much) or frayed (nope, not going to try).
Without cracking the thing open you can't do much besides guess.
depending on your willingness to open it and look inside it might just be something you live with, or something you pay someone to look at.
But I don't think it's going to burst into flames.
-Terry
-----
"so listen up boy, or pornography starring your mother will be the second worst thing to happen to you today"
TF2: Spy
It might be just loose (something you could fix on your own) or worn down (not so much) or frayed (nope, not going to try).
Without cracking the thing open you can't do much besides guess.
depending on your willingness to open it and look inside it might just be something you live with, or something you pay someone to look at.
But I don't think it's going to burst into flames.
-Terry
-----
"so listen up boy, or pornography starring your mother will be the second worst thing to happen to you today"
TF2: Spy