Question games restart when i higher the resolution

Jan 7, 2020
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i recently upgraded my graphics card after the last one seemed to die gtx 970, i have upgraded to a geforce 2060 super oc 8gb, i can play cod in the 1920 x 1080 fine but the minute i increase the resolution the PC just restarts, thinki9ng maybe its a psu problem but would like to now before i buy one , any help would be great, also over games crash when playing in 3840 x 2160
specs:
windows 10 64 bit
intel core i7-6700k
16 gb ram
z170x-gaming gigabyte technology