Hello Rick, In my experience all tics can wax and wane and be transient, even the complex ones. It seems that every 6 weeks to three months, new tics develop and others disappear. Yes, they can even cycle around again. That being said, tics often come with awful tag along behaviors,
such as anxiety or OCD. Your son may be having some compulsive behaviors, that may not be tics. I would suggest watching and see how it progresses, and then look for an evaluation.
Blessings, Kelly