Gutter sagging is a common issue that can be easily fixed by replacing the screws or brackets that hold it. If the gutter uses screws or barbs, you'll need to remove the old ones from the sunken section of the gutter with a hammer claw or screwdriver. Then replace them with new gutter screws or nails. There are three ways to tighten the gutters that have started to come loose on the sides of the house, and the method you use depends on how far apart the gutters are.
It's easy to spot gutter sagging, since the gutter “sinks” in one area instead of being straight like the rest of the gutter. When the gutter holds water in an area so that it cannot drain properly, it will release it. If not selected, the gutter will eventually roll back, that is, when the gutter is tilted in the wrong direction. The gutter is then connected to a downspout that conducts rainwater from the gutters directly to the ground or away from the foundation of the house.
If a lot of water comes out of the downspout, but the upper gutter pours water over it, then there are likely other problems besides obstruction. If your gutter tips have fallen off and you can't find them, you can buy them at most hardware stores that sell gutter supplies. Neglecting gutters is when you forget about them for a couple of seasons or years and they fill up with debris everywhere. Whenever you can see a strip of sky between the gutter and the wall, that gutter is definitely loose and should be repaired soon.
But what if your gutters are clean and also glued to the wall? The next thing to check after that would be the pitch. If your gutters have a small visible space between them and the fascia plate, then they need to be re-secured. Keep in mind that during heavy rains and storms, no one has gutters that trap all the water or manage all the flow. It's important to regularly inspect your gutters for any signs of sagging or obstruction so you can take action before any serious damage occurs.