Dehydration is the biggest trigger for me as well, as far as I figured out.

Not to be crude, but if my pee isn't basically clear, I immediately start slamming fluids until it is again.

I’ll add fatigue/stress.

A long bike ride after a stressful week and off it goes.

An interesting observation from a cardiologist to me was that cyclist have 5x the rate of rhythm disorders compared to to general population.

But… ‘It’s hard to work out if that’s drug induced or not’.

Say maybe lay off the performance enhancing drugs.