Some think they work loose, others think the plastic shrinks. Either way, many of us have discovered intake bolts that are very loose. Be sure not to over-tighten them, and damage the plastic intake, or break the tiny bolts.
If you look, you can find arguments about whether they need to be re-torqued or not. Some will say that the o-rings are fine for sealing, even after the bolts loosen some. Some say that they feel a difference after tightening them.
I checked mine, and several of them took more than a full turn to reach 105 inch pounds.
Definitely don't use the red Loctite. You'll hate it if you ever need to get it apart, and if it is caused by the plastic shrinking, you won't be able to tighten it more. I did see one person say that after torquing it with blue Loctite, it stayed tight. I wonder if that is because the bolts didn't back out, or if they seemed tight because the Loctite caused more than 105 inch pounds of resistance.