MacBook Pro Possible Hardware Malfunction

My Mac is a month old and I have encountered the following problems:

1) Dock - Start my Mac from shut down then login, move the mouse to the bottom of the screen to make the dock pop up. Problem doesn't occur if Mac starts from restart or sleep.

Solution - none

2) YouTube - when I click full screen it normally zooms in with a little cut in the video, no problem but mine laggggggggs during the transition

Solution - Remove website data, however this solution is temporary, after a few days the problem comes back. 195 website data deleted, is this normal? for a computer to lag during the transition into fullscreen when there 195 website data.

so that's all the problems I have encountered, here are some things I tried to find out if my hardware is malfunctioning.

1) Disk Utility - problems are still there, no hardware errors

2) Command D - (enters hardware check mode) tested, and no problems.

Sooooooooo..... Any suggestions? Or you have the same problem? Or you know what's wrong? Please tell me. Thanks