I had this issue before.
In the image below you can see arrows pointing to one end of a spring.
That white plastic piece is getting upward force from the spring, but not enough.
The angle between the two ends of the spring needs to be increased.
I did this by pinching the ends where they enter the coil and forced the coil open a little more.
You don't want to bend the ends of the spring, you only want to undo the coil a little bit.
This will increase the angle between the ends, so when you reinstall it, more pressure will be applied to the white piece.
Not saying this is your answer, but it worked for me. Good luck