I haven't, but I have read of numerous accounts by apparently real people claiming that the MRNA COVID vaccine and the disease itself had put them into much more frequent and longer bouts of AF.

The aphorism in the heart rhythm science is that 'AF begets AF.' Once you have it, it will return, and for the majority of sufferers, it will return more frequently, and possibly last longer each time. For now, you appear to be okay, but if you're spending as much as six hours and up in AF two or three times a week, you should consider an ablation. The reason is that the fibrillating heart remodels itself, and the process of remodeling is not always completely reversible once your AF is controlled better....if ever. Ablation will stem the propagation of the extra electrical impulses that tend to issue from the ostia (mouths) of the four pulmonary veins that empty oxygenated blood returning from the lungs into the left atrium. The ablated tissue prevents propagation of the impulses around the entire endothelium, which causes the underlying muscle to contract.

The remodeling usually involves two things: more fibrosis, and enlargement or thickening of the atrial walls. This makes it harder to beat over the normal distance that the muscle moves itself, meaning you won't have the same volume of blood as before. The remodeling can take many months, but the more AF you have, the more remodeling takes place. So, again, if you're beginning to worry because you're more frequently in AF, and it doesn't seem to be abating over time, then you should at least consult a good cardiologist or ask to see an electrophysiologist for an evaluation.