Lines on Drywall
I don't know how to describe the issue other than there are lines showing up on our wall and I can't figure out what exactly it is, or how to fix it. We think the lines are fairly new. This is a wall that does have outdoor exposure on the other side, so water is a possibility. We also were without AC for 3-4 days this summer when it was very hot and humid, not sure if that might have something to do with it.
The picture that's attached shows the lines going in different directions, however, in some areas of the wall, it is only horizontally.
No other walls seem to have this, just in one room (2nd floor bedroom, roof is above).
Anyway, picture is attached. If anyone has any idea what might be the cause and how serious it is, I would greatly appreciate it.