(I sent this as an email to support and haven't yet got a reply)
SO I had this problme for a while, ever since ReLive 16.12.1 was released (and continues to happen on 16.12.2), and its where when I restart my PC or sometimes put it to sleep the drivers will break. So, on Heaven Benchmark on the first scene I will normally get 45fps but after the drivers break I get around 10fps and this translates to games. In Overwatch I will struggle to get 30fps and in some rare cases can't get above 5fps.
Specs: i5 6600k O.C 4.5GHz MSI R9 390 Asus Z170 Pro Gaming 16GB 3000MHz DDR4 RAM Windows 10
Please enlighten me with why I am getting this problem.
P.S I posted about this on this forum and didn't get a SINGLE reply, its been about 3 weeks. Thanks.