Welcome to VU!
What juice type are you running in this coil?
50/50 mix -- 70/30 mix -- Max VG ?
Do you chain vape it ?
What wattage are you running these coils at with your juice?
This coil "should" be able to handle 80/20 or Max VG, but from what you are describing the juice is not wicking quick enough.
It's possible that you are over powering the coil and burning off what juice has wicked into the cotton quicker than it absorb more juice, especially if using Max VG. When you loosen the lid, you are removing the vacuum build-up in the tank, thereby allowing the juice to "freely" flow into the cotton faster due to gravity.
0.15ohm XL-C4 Chip Coil - rated for 50-215W