Aurora-R7, performance issues

Hello,

I believe I'm having issues with my R7 - I've taken it back to my dealer once and all they've done is re-install Windows when I believe I have a hardware issue. 

The specs are: Processor - Intel Core i7 8700 Graphics card - GeForce GTX 1070 RAM - 16 GB 

My problems are as follows: 

- very variable booting 

Sometimes it boots into Windows instantly, others it takes 3 - 5 minutes, and when it takes longer it does not show the "Alienware" logo and gives only a blank screen (sometimes sending no signal to the monitor at all)

- Witcher 3 frame drops 

While I am running the game on ultra settings, as a 3 year old game I assume my PC should have no problem running it. However in areas with trees or foliage there is noticeable drop in frames 

Brigador - loading times tripled/quadrupled 

I stream games and have recordings of the PC's performance when I first purchased it. Back then levels loaded almost instantly. Now they take 10 - 20 seconds. 

Is any of the above normal? I have only had the PC 3 months (performance issues began about a month after purchasing) and have only installed a few games and Ad-Aware 

Thanks in advance