Episodic
Bicycle ergometer
Shock, compensation and exhaustion
gravitational force
Raynaud's Syndrome.
Intermittent machines are maintained by closely examining them on a regular basis and replacing any damaged parts. Lubrication and coolants are topped off as needed to keep it running at peak performance.
Use of poetic forms with regular, predictable rhyme and rhythm schemes
Permanent is present or happening all the time. Periodic comes and goes at regular/predictable intervals. Noon is periodic. I'm not sure cyclic is different from periodic but it if is it must mean comes and goes consistently but not at predictable intervals. A vowel will always occur in text but when is not predictable.
predictable
A malarial type fever characterised by intermittent bouts of hot and cold shivering fits that occur on a regular basis.
Stress is a regular verb so you add -ed to make the past form: stressed
There could be a bad or melted electric connection on the wiper switch connector.
Raynaud's disease is the answer. It is categorized under "Peripheral Vascular Disease".