Will my Non O visa renewal be affected if I don't meet the exact monthly transfer requirement?

I am currently on a Non O visa with retirement extension. I have the required 800,000 in the bank to qualify.

My Visa was renewed on 24 June 2020.

I want to withdraw 400,000 to buy a vehicle. That will leave 400,000 in the bank. To renew my visa in June 2021, I believe I will have to show 12 monthly payments going back to June 2020, that will demonstrate I have an income plus savings that will equate to 800,000 baht.

That would be approx 33,333 baht per month over the 12 month period. Does that mean it has to average out over the 12 payments or is it strictly a minimum of 33.333 baht or more per month. My problem is that in July I only transferred 31,000 baht but generally I will exceed the 33,333 baht by at least 2 or 3 thousand per month.

I hope I have stated my question clearly.

Thank you.