Are there restrictions on exiting and re-entering Thailand on a visa exempt entry?

You have good advice Kurt Brett...hope you are successful with your new entry.

I close commenting.

@Kurt ******

while it is technically legal to do that I think in this day and age you're going to get pulled aside and questioned on why you just flew out and back to get a new 30 day visa exempt entry.

I would certainly have the 3-proof-ofz when flying back in just in case you're asked for them

Proof of 20K baht or the equivalent in CASH

Proof of onward travel in 30-60 days

Proof of a hotel booking or confirmed lodging.

No one can tell you with 100% accuracy IF you'll skate right in or be questioned, all you can do is be prepared.

I agree with other posters IF you don't have TWO 30 day visa exempt entries by land this year, bounce out and back at a land border with a visa run company to get you a new 30 day visa exempt entry.

Out of curiosity was this your first time coming in on a visa exempt and were you asked for an exit / return flight and to show 20k cash?

If you're going to do a visa run and get an exemption stamp it's probably better to go to one of the land borders with a visa company. Flying in with no visa is a bit of a risk these days.

No problem. You have "unlimited" entries by air, and two entries by land. The definition of "unlimited" is whatever the immigration officer thinks it is, so don't expect to live here on those visa exampt