What you describe is very similar to the symptoms of a bad power button, but there are some things that aren't typical. For instance, when a power button is bad, it's usually hard to get it into recovery mode, and it may restart or shut itself down once it's there. Power buttons that are working intermittently or partially stick can have some weird symptoms though, so there's still a possibility that's what's wrong.
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What you describe is very similar to the symptoms of a bad power button, but there are some things that aren't typical. For instance, when a power button is bad, it's usually hard to get it into recovery mode, and it may restart or shut itself down once it's there. Power buttons that are working intermittently or partially stuck can have some weird symptoms though, so there's still a possibility that's what's wrong.
If it is a bad power button, it will probably need to be replaced. Not sure what kind of power button that phone takes... many Samsung buttons are soldered on, but some are on a flex cable and can be replaced without soldering. The only thing I've found that helps a power button (other than replacement) is that sometimes putting some electrical contact cleaner on it (if it's the soldered on kind) and pressing the button a bunch will help. If you don't have any electrical contact cleaner, you can try some isopropyl alcohol with a bit of wd-40 in it. It's a long shot, but it worked for me a couple times before I learned to solder them!
What you describe is very similar to the symptoms of a bad power button, but there are some things that aren't typical. For instance, when a power button is bad, it's usually hard to get it into recovery mode, and it may restart or shut itself down once it's there. Power buttons that are working intermittently or partially stick can have some weird symptoms though, so there's still a possibility that's what's wrong.
If it is a bad power button, it will probably need to be replaced. Not sure what kind of power button that phone takes... many Samsung buttons are soldered on, but some are on a flex cable and can be replaced without soldering. The only thing I've found that helps a power button (other than replacement) is that sometimes putting some electrical contact cleaner on it (if it's the soldered on kind) and pressing the button a bunch will help. If you don't have any electrical contact cleaner, you can try some isopropyl alcohol with a bit of wd-40 in it. It's a long shot, but it worked for me a couple times before I learned to solder them!