الجواب وباللہ التوفیق

Your stated movements are considered slight which do not invalidate salah. Although, any movement in the salah is considered makruh. If necessary, only a single hand may be used. 

Salah becomes invalid, only when there are three movements in succession, because that constitutes excessive activity. But if the three movements are done nonconsecutively, these are considered as minor activities and will not invalidate the salah. 

واللہ اعلم بالصواب