Well, i bought a raspberry pi 3 model B, when i turn on the raspberry it is all working fine, then after 1/2 minutes, the screen starts glitching, the image starts glitching in waves, like the interference that old TV made when a cellphone rang besides. After a while of that glitch, it starts appearing some horizontal green lines, like burned pixels and the screen goes black. I know that the raspberry still works because the power led and the green led are flashing. Is there any fix to this problem?
Notes: I´m using a HDMI-to-VGA Adapter
SD Card: Toshiba 8GB
Monitor: VGA 1280x1024 Samsung 60Hz
EDIT: So, i really think that is the power supply. At first i thought it was the Adapter, but when recently i was doing my "studys" and i changed my power supply to a usb-to-microusb puggled in a Apple usb charger (i knew it wouldn't enough power and i wouldn't get out of the boot fase) and one thing i noticed was that, this glitch i was having was fixed, i stood with the pi on for about 10 minutes and no glitch. Note: i looks like it is fixed, but i couldn't get out of the boot fase to the OS graphical ambient for lack of power, so i'm not 100% sure if it is the power supply the problem.