I appear to have some interrmittent problem, and one thing that occurred to me as a possible fix isn't! :-O :-)
My Galaxy S II phone has NEVER FAILED to recharge when plugged into a recharger.
I had one vehicle dock. And, every once in a while, I use it -- primarily for the Google Nav App (which is SO EXTREMELY USEFUL if you aren't familiar with the roads to get help to know exactly where to turn, etc.)!
Every time I "plug" the end of the vehicle dock into the phone, the phone knows it -- even if it doesn't have power at the same time! I have it locked. ONLY when I have plugged the vehicle dock into the phone, the "keypad" used to enter the digits to unlock it shows up very briefly, but it immediately goes to the talk app.
(For those who may not have seen the vehicle dock, the end of it "moves" back and forth. You put the Galaxy S II into the plastic portion with the four corners, and then move the end, with the plug, toward the phone, thus connecting the plug on that "movable portion" into the "jack" of the phone.)
My problem involves power.
Most of the time, when I plug the Galaxy S II into the vehicle dock (of course with the cigarette lighter end portion of the cord plugged into the appropriate "power port" of the vehicle, and I've used my Toyota Corolla and Mom's F-150 pickup truck), I hear a little "beep" and I see a "lightning-bolt" type of symbol in the green battery indicator/icon. Also, when it has power, the 4 "buttons" on the end (menu, applications, return, etc.) light up and never go dark, and the screen never goes dark -- if it has continuous power.
However, occasionally, it doesn't get power. I do NOT hear a beep, see the "lightning-bolt" symbol, and when using the Google Nav app, the screen will go "very dim" if it has been a few seconds to minutes since it last spoke or the screen was last touched. At these times, it DOESN'T have power, so it is running on battery power. When it is like this, the screen will get brighter, temporarily, when it is speaking to me. This afternoon, coming home on I-95, it said "in 2 miles, take exit 201" and the screen got bright -- temporarily. It returned to very dim after a few seconds.
When this first start happening, I was thinking there was something in my vehicle dock, either the cord itself or the plastic portion the phone sits in, likely the movable end that "plugs into the phone".
So, I ordered another vehicle dock!
It came the end of last week.
Sunday I used it in Mom's truck. It worked.
I used it every day this week coming home from work. I know the way very well, but I just wanted to use it a lot to assure it continued working.
It worked every time I tried it -- until yesterday afternoon on the way home! Same symptoms.
I pulled over. I plugged it into a different place in my car, in the console where I have a CHARGER for the phone. No power.
Exact same this afternoon. No power.
Well, I just did some additional experimentation in my car and Mom's truck...
Using a volt meter, I have confirmed that the "power ports" in the vehicles have power. Even though they have power, and I have certainly assured the more obvious things like the cigarette lighter portion is plugged well into the "port", no power. This was true with BOTH vehicle docks, in both vehicles, just now.
As I think in troubleshooting mode, I am now thinking it is less likely that both vehicle docks (and both are not that old, as I only got the phone in October of last year, and the second dock is a week old) are having the same problem!
I am not sure where to touch the red and black leads of the volt meter to the metal portion of the cord, to confirm power. I have not confirmed power on the metal end while the other cigarette lighter end was plugged in, but I am not really sure it is that.
Can anyone provide me any ideas on what this may be; what I may check next?