1. Can samyaktva be lost and regained in the same birth?

Yes.

• As long as it is not kṣāyik samyaktva, a jīva can:

- Attain samyaktva - Lose it (fall to miśra or mithyātva) - Regain it again all within the same birth, and even many times.

The only exception:

• Kṣāyik samyaktva (samyaktva by total destruction of darśana-mohanīya karma)

– once attained, it is never lost in any birth.

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1. Types of samyaktva (relevant here)

Classically (both Digambar and Śvetāmbara accept this framework, terminology may vary slightly):

1. Aupśamik (Upśamik) samyaktva – by suppression (upśama) of the seven darśana-mohanīya prakṛtis. Very unstable.
2. Kṣāyik samyaktva – by complete destruction (kṣaya) of those seven. Absolutely permanent.
3. Kṣāyopśamik samyaktva – by partial destruction + partial suppression (kṣaya + upśama).
4. Vedak samyaktva – just at the point where suppressed samyag-mithyātva is destroyed and the soul enters pure kṣāyik samyaktva.
5. Sāsvādan samyaktva – the last “taste” of samyaktva while falling down from samyaktva to complete mithyātva.

Your question is specifically about:

• Aupśamik samyaktva
• Kṣāyopśamik samyaktva

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1. General rule: interval between loss and regain

Karma-grantha tradition (accepted in principle by both Digambar and Śvetāmbara) says:

• If samyaktva is lost once, it can be regained:

- Earliest: after an antaramuhūrta (less than 48 minutes) - Latest: within an ardha–pudgala–parāvartana (a very huge, but still finite time)

So:

• A jīva who has once had samyaktva must regain it at least once again before that maximum interval ends – whether in the same birth or in later births, depending on karma.

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1. Kṣāyopśamik samyaktva – how many times in one birth?

From Digambar karma-śāstra based works (like Samkit – Faith, Practice, Liberation summarising Śaṭkhaṇḍāgama / Gommatsāra tradition):

• In the entire saṃsāra:

Kṣāyopśamik samyaktva can arise numerable times (i.e. very many, but not literally infinite).

• In a single birth:

Kṣāyopśamik samyaktva can be attained, lost, and regained between 2000 to 9000 times.

That means:

• One human (or other gati) life can contain thousands of separate “phases” of kṣāyopśamik samyaktva.
• Each phase may be very short (possibly less than antaramuhūrta), and between two phases the soul may slip into:

- Miśra-darśana (mixed view), or - Mithyātva (wrong belief).

Traditions:

• This numerical range (2000–9000) is explicitly given in Digambar karma literature.
• Śvetāmbara texts generally do not fix this exact number, but they fully agree on the principle:

- Kṣāyopśamik samyaktva can be lost and regained many times, even within the same birth.

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1. Aupśamik (Upśamik) samyaktva – how many times in one birth?

Here the picture is slightly different:

• Texts like Kartikeyānuprekṣā (and its commentarial tradition) say:

- Aupśamik samyaktva - Kṣāyopśamik samyaktva - Vi-samyyojana of anantanubandhi kaṣāyas (conversion of highest-intensity passions to lower types) - Deśa-virati (partial vows)

can all be attained and abandoned “innumerable” times (asaṅkhyāta times) over the course of saṃsāra.

Important nuance:

• This “innumerable times” is stated about entire saṃsāra, not only about one single birth.
• For one birth, classical texts do not give a fixed numerical cap for aupśamik samyaktva like they do (2000–9000) for kṣāyopśamik samyaktva.

From the doctrinal standpoint:

• Aupśamik samyaktva is even more unstable than kṣāyopśamik samyaktva, because it stands only on suppression (upśama), with no destruction (kṣaya) yet.
• Therefore, it is accepted that:

- Aupśamik samyaktva may arise and fall many times even within the same birth. - Each “spell” can be very short, sometimes even within an antaramuhūrta. - But the śāstra does not standardly specify “exactly how many” per birth (unlike the 2000–9000 figure for kṣāyopśamik).

So as per available authentic Jain sources:

• Yes, a jīva with aupśamik samyaktva can lose and regain it repeatedly in the same birth.
• No precise per-birth maximum count is traditionally fixed in the main texts; only “innumerable times” across saṃsāra is given.

Both Digambar and Śvetāmbara accept:

• The existence of aupśamik samyaktva
• Its instability
• The possibility of multiple losses and regains, including within a single life.

The detailed numerical limits, however, are mostly elaborated in Digambar karma-granthas.

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1. Key take‑aways in simple form

• Once samyaktva has ever arisen in a soul, liberation is guaranteed within a maximum of an ardha–pudgala–parāvartana period, no matter how often it falls in between.
• Within a single birth:

- Kṣāyik samyaktva – can be attained only once, never lost. - Kṣāyopśamik samyaktva – • Can be lost and regained many times. • Traditional Digambar figures: roughly 2000–9000 times in one birth. - Aupśamik samyaktva – • Also can be lost and regained many times in one birth. • Texts state “innumerable times” overall in saṃsāra, but no fixed per-birth number is given.

• Every time samyaktva re‑arises (even for less than 48 minutes), the soul’s journey toward mokṣa becomes closer and the total remaining time in saṃsāra is reduced.

For a simple overview of what samyaktva is and how it is cultivated in practice, you can read more here