Like the title states, it suddenly became loose. I checked the screw, but it was still fine! If you push the leg just slightly, it will fall down without difficulty. The right leg is harder to push down, you actually have to use force. This is all of a sudden! What happened?

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Answer:
I know you ask on here 1st to save yourself time from paying a visit to the shop. But its best to check with the shop where u purchased it from. You dont wanna risk breaking anything cuz u can't hold anyone responsible on here.

It could be that the metal part which hold the leg and the main frame got a lil bent and the screws aint holding them in the position it used to.