Is the abundance of gases released during prayer, which necessitates repeating ablution and prayer many times, a legitimate excuse that waives the obligation to repeat?

The basic principle is that nothing should be deemed to have exited (the body) except with absolute certainty, a certainty you can swear by. If it is merely a whisper (waswasah), do not pay attention to it.

If what was mentioned is true, then it is sufficient to perform ablution (wudu') after the time for prayer has begun and pray with that ablution whatever one wishes of obligatory and supererogatory prayers until the time (for prayer) ends, because this is similar to the case of one afflicted with incontinence (sahib al-salas).