RT-AC87U High Temp

Hello,

Yesterday I've setup me new router and i was surprised to see high temprature data:

2.4GHZ: 46C 5GHZ: 67C CPU: 78C when room temprature is 21-22C

Is this normal , do i need active cooler..? What i have to do in summer when room temprature is 30-33C?

Should i expecting 5GHZ R.I.P?

Thanks in advance