I have tried reseating the cable, but I have not tried a new cable yet , I'll try one.
It's been fine with the same specs for a few years:
i5 6600, 2x8GB DDR4 2133Mhz, Gainward GTX 1070 GS, 550W (Antec I think, 80+ bronze), SanDisk 240GB SSD and some AliExpress RGB fans lol