Can I receive a visa exemption a third time when traveling to Singapore and back to Thailand?

Hello! I wanted to have your opinion on my situation, it would be helpful if some of you could share your experiences

I came to thailand on May 2nd and benefited from a 2 month visa exemption

On May 17th I had to come back to my home country (France) and came back on May 21st.

When I came back, a new stamp has been done on my passport so I have been given a second visa exemption until August 21st

In September, I will go to Vietnam to apply for my DTV Visa

But in the meantime, next week, I will go to Singapour (come back on August 18th so before my visa exemption expires)

I’m thinking maybe that could seem suspicious to immigration agents

1) Do you know if I can be granted a visa exemption a third time?

2) Should I go to the immigration next week to get a visa exemption extension (+1 month)? In your experience, is this easy to get and how long does it usually take to wait at the immigration (will I be done at 12 if I get there when it opens)?