Will immigration issue a problem with my flight return date exceeding the 180-day limit for my DTV visa?

You’ll be fine. I would book a cheap flight to some city in Vietnam or KL just in case. They’re pretty cheap

It shouldnt matter, I didnt even have a return ticket booked, you can just do another border run before then.

Do people not realise you can extend the 180 days in Thailand? I'd just say I'm going to do that?

Onwardticket.com

Beyond 180 days by exactly how many days?

Book a cheap one way bus ride to Laos and cancel it later

DTV doesn't require a return flight.

Your question is confusing ??? So you have a DTV and you stayed in Thailand 180 days and have gone to Australia where you have stayed more than 180 day. Now you want to return to Thailand and get a new 180 day stamp. That's how it sounds to me.

Your DTV is for 5 years up to 180 day stay at a time. You must leave or apply for an extension to reset the 180 days. But you can go out and stay out as long as you want same day return or as long as you want. When you return you get a new 180 day stamp. It sounds like you have no issue you just think you have

It doesn't matter. You can do a border run anytime before that, or extend in country (the latter not really recommended, tho).

I’m confused Do you mean entry or exit into Thailand?

You can arrive into Thailand any time within the five years of your DTV Visa and if you’re talking about departing Thailand, after your first six months you will get an overstay fine

You will be fine bro just enter