I've had problems with two 1070ti's that I've gotten. The first one always seemed to reset since my monitors black screened but came back and close applications I was gaming on. The second did the same but then it got to a point where everything would black screen. The card and everything in the computer would still run, but no signal to monitors. I uninstalled and reinstalled NVIDIA drivers, tried different pci-e slots, got a new power supply, reinstalled all cables in my computer, tried different settings in the NVIDIA control panel, and made sure my power settings were either on high performance or ultimate performance. My PNY Quadro K5000 4Gb and AMD Radeon RX 550 4GB work fine, but I wasn't able to try any higher end graphics cards. Everything in my pc was bought this year and new. Not sure what to do now.
Specs:
Motherboard: MSI x370 Carbon Pro
CPU: Ryzen 7 2700x
Ram: G Skill Ripjaws V Series 32 GB
PSU: EVGA 750 BQ 80+ Bronze 750W
OS: Windows 10 Home
Peripherals: Gaming mouse and keyboard, webcam, microphone, wifi/bluetooth usb, graphics tablet, led strip