@Tina ***************
NO.
You have been granted a multientry Visa not requiring any requalification unless you try to extend in Thailand at Immigration.
You will be then subject to whatever criteria they ask.
IF you just leave and renter at 6 month increments you are clear of any further documentation.
That is the current Visa requirements and rules, however going forward you just never know what will change.
As it stands 6 months on entry, leave and reenter for 5 years.