Also, your Xorg log shows the mouse "BM30X mouse" repeatedly disconnecting and reconnecting, which may cause the whole screen to freeze briefly because it is in Xorg. Please try removing that mouse from the machine and tell us if that fixes the bug.
Also, your Xorg log shows the mouse "BM30X mouse" repeatedly disconnecting and reconnecting, which may cause the whole screen to freeze briefly because it is in Xorg. Please try removing that mouse from the machine and tell us if that fixes the bug.