> So when you change job of your own initiative, it is assumed that you first get a new position, then give a notice and start your new position.

It's pretty much the same in Europe (except when you take gaps, of course).

> I'm not saying it's right or wrong; just explaining how long and recurrent gaps can be interpreted.

Recurrent gaps can be interpreted in a lot of different ways, but there is just one real reason behind them. But I see how recruiters can assume things before asking for real answers (e.g. 6 months gap and this guy hasn't been able to find a job? Next!). It's a pity.