One problem that could be causing a popping sound in your walls or in the attic is pests.
Continuing popping noises in the attic.
Also when the temperature becomes very hot or very cold or when sunlight warms one part of a home and not another these noises may become more pronounced.
In the case of a vent install a mesh wire screen.
The sun hits your roof and heats it up.
As the lumber expands it moves.
A loud popping noise in the attic is often very common especially when there are extreme temperature differences such as large and rapid fluctuations between night and day temperatures.
A california friend of mine has such a creaking overhead and it bugs him no end.
As for the popping noise in the morning and evening that s a different mechanism.
Getting rid of these attic dwelling pests.
Undoubtedly the noises come from the expansion or contraction of the roofing or ceiling framing members.
It s thermal expansion and contraction.
The air will still be able to exit your home but birds and other pests.
Avoid leaving pet food outside.
It can ofter sound as if the roof is broken in some way or the roof is going to collapse.
At night attic can sometime make loud creaking and cracking sounds.
Any type of food draws rodents and birds close to your home and makes them.