I think this is more a graphics issue, background colour, etc. The avast icon isn't a royal (bright) blue more a blue grey and the sheen effect makes it look more grey for some.
Provided it doesn't have a red bar through it and it rotates when files are scanned, the colour is unimportant.
System restarts can be for many reasons, software and hardware, as such this is difficult to pin down. If your screen just goes black and reboots this is more likely to be hardware (PSU, CPU or RAM) possibly heat related since it is Summer.