sudden issues with charging and sd card

Hi guys,

Background - been using a 16 gb north American version since august this yr.
I teamed it with a sandisk 16gb sd card. Never had any issues at all.
I upgraded to jellybean about a month back.
2-3 weeks no issues.

Since the past week-10 days I have been facing the below issues:

1. Whenever I plug in my charger usb I get a notification of "usb connected" followed immediately by "usb disconnected".
Charging starts after 5-10 secs.. used to start immediately before. Even while the fone is charging... the usb notifications keeps toggling.
The usb notifications also keep popping up even when the switch is off but the cable is plugged into the fone.

2. Upon disconnecting the charger. ..at times... I get a notification error - "cannot access device. High power source..."
The two points where I have always charged my fone is > at home thru the charger and > at work by pluggin the usb iinto my laptop.
Never had this issue earlier

3. After a week of the first problem- I started to get the sd card error.
Sd card is blank or has unsupported files.
This error keeps popping up randomly. Wen the error is not there - I can access my card normally.


I havent dropped my fone or anything like that. I have avast and it does not detect any viruses.
Fone is NOT ROOTED.

Since Im using the American version in india, the service centers here will not accept my phone.

Anybody out there having similar problems?
Any solutions or suggestions are welcomed!

Thanks guys.

 

Thanks harry. I cleaned the pin and it looks like the usb issue seems resolved. But the sd card issue remains. It pops up n goes away on its own. I read somewhere that the s3 apparently at times "fries" sd cards. Maybe a new card may do the trick.