RX 470 Weird Voltage Spike

Hi I bought asus strix rx 470 and running at 1250 mhz memory 1650 mhz voltage 1.150 in gpu tweak but in game sometimes is see voltages goes to 1.200 ~ 1260 on its own rarely for a second both on gpu-z and hwinfo. Most of times is 1.140v but i dont know why its go higher i just use many drivers but nothing. I am worry if it can harm my gpu. Also rarely sometimes i have no signal issue in games and need to hard reset to get back a signal. What can i do? Thanks