cada cierto tiempo

= episodic, every so often, every now and then, every now and again

Ex. Politics often makes library development episodic and unpredictable.

Ex. Every so often, the mist cleared and I could see sunlight in the distance.

Ex. I can walk on that foot, but as you described, every now and then without warning, the foot and ankle give way.

Ex. Every now and again, someone gets the fame they deserve.

* * *

= episodic, every so often, every now and then, every now and again

Ex: Politics often makes library development episodic and unpredictable.

Ex: Every so often, the mist cleared and I could see sunlight in the distance.

Ex: I can walk on that foot, but as you described, every now and then without warning, the foot and ankle give way.

Ex: Every now and again, someone gets the fame they deserve.