Coolant Leaks Under Radiator Overnight

I have a 2017 Volvo company truck with a D13. I've had it since brand new for about 6 and a 1/2 years.. About 2 years into having this truck the radiator was replaced. I've been getting some leaks underneath the radiator in several spots. It only seems to leak when it gets cold overnight. Once everything heats up, the leaks stop.

There are no signs of leakage by the hoses.
Truck has 550,000 mi.

It's about 45ﾟ outside where I'm at. No signs of leakage. I start the truck up and then I see some leakage on r side under radiator.

But like I said before, after things warm up it stops.

 

UPDATE:

Took it to the shop. They replaced the radiator.
The other radiator was installed about 4 years ago. They said that 4 years is actually a long time. I didn't think they needed to get replaced so soon.