Is this unusual behavior for your dragon? They all kind of go on their own schedules. Some go a couple of times per week, some go daily. The little guys will often go more than once a day.
Im not expert by any means, but I would say there is nothing abnormal about that, unless you mean 3x a day for 3 days? Is the poop liquid? normal color?
A lot of healthy dragons poop daily or almost daily! Sometimes they poop less frequently if they are cool, which slows down their digestion. Has your beardie's enclosure or the room it's in gotten warmer? That could make it poop more often. Unless it's diarrhea or your beardie is acting unusual in other ways, more frequent pooping is nothing to worry about.
My beardie poops once every day! Totally normal for him, he's happy and healthy.
You have no need to worry unless the poop is "clear the room" smelly or excessively loose/liquid.