Is the intermittent and irregular emission of gas, especially in large and uncontrollable quantities during prayer, considered a continuous emission of gas ( سلس ريح), and what is its remedy?

Since the matter is as described, your ruling is the same as that of a person with urinary incontinence ( سلس ). It is permissible for you to perform ablution for each prayer after its time has begun, and to pray with this ablution as many obligatory and voluntary prayers as you wish. You can also consult specialized doctors regarding its treatment.