Yep my DS1 has had tics since he was about 4, he's nearly 11 now & they come & go.
He has vocal ones including throat clearing & coughing & just a weird hmmmargh noise. They generally last about a month or so.
Then they are replaced by movement ones such as face pulling, neck stretching, mouth opening really wide. Then they go away after a few weeks.
Its very odd & I took my DS to the doctors when he was about 5 & the doc just said they were common & they would go away.
Like your experience they are worse when watching TV or concentrating & he does them in the classroom as he has said that his classmates have started to imitate him. They are absent now & have been for months but they can return at any time.
Other things are that he has always been an early riser, always up before 6am no matter what time he goes to bed. He has issues with clothes, he can't bear scratchiness & I have to cut the labels out of everything & I buy him the Skinkind school polo shirts from M&S. He does OK at social skills but he seems to float alongside friendship groups & doesn't really have any firm friends.
I love him dearly but he's just a bit left of centre, he's also G&T at school & has the most amazing imagination & can produce startling work.
I've wondered at times if he is on the spectrum but its never been mentioned by school & he's starting secondary this year so I'm assuming not