Random waves of sadness hit me while hiking, even in beautiful spots

I’ve been hitting the trails regularly for the past year to clear my head and recharge. Usually, being outdoors lifts me up, but lately, I’m getting these sudden waves of sadness out of nowhere - even when I’m surrounded by stunning views or deep in the woods. It’s like an emotional crash that sneaks up on me during what should be peaceful moments. I’m not dealing with any big life changes right now, and I’ve tried focusing on mindfulness and breathing exercises when it happens, but it only helps a little. I guess I was hoping being outside would keep those feelings at bay, but that’s not the case right now. It’s frustrating because the last thing I want is for hiking to be associated with feeling down. Has anyone else experienced unexpected sadness during activities they love? How do you handle those moments so they don’t overshadow the good parts of your day?