Drops fps pc rtx 2070 ryzen 5 2600

hello I have an rtx2070 16 of ram ryzen 5 2600 1tb and 240tb and I have the gears 5 limited to 60 fps and I have lows up to 45 and it is very rare that that happens of 10 games 2 I have that I do not know why contact tc but there is reply help me pliss