Arduino output goes high or low automatically

Projects General Guidance
1

after power on(ie after 10 to 20 mins) arduino output pins(Pin 16,17 of atmega328p) automatically goes high or low without program control

load is 2 5v relay

2

Give us a clue by supplying the code and circuit.

Weedpharma

3

Which one is it? Does it go high or does it go low? Unless you've invented a quantum computer, it can't be both.

And don't use pin numbers. Use the Arduino names for the pins.

4

If it's the ATmega328P-PU (p28-pin PDIP) then '16' and '17' are Pin 10 and Pin 11.