What should I expect at Thai immigration after multiple tourist visas and frequent entries?

Hi peeps.

So, I went to Vientiane this week to get another Tourist Visa Single Entry and everything went smooth, flew to Suvarnabhumi and arrived Thursday around 9 pm, went to immigration and this lady who was sitting at the counter told me, ”I don't know if I can let you in. You have been here a long time” (less than one year).

She called for a supervisor of some sort and there comes another lady, very friendly and she asked me the same question as the immigration officer and got the same answer - ”I’m traveling around Thailand with my half Thai girlfriend.” I got my stamp but I must admit I was very nervous.

When I went to Vientiane I had:

2 Visa Exempt 30 days + 30 days extension (from Sweden when I got here and from a trip to Singapore).

3 Tourist Visa 60days + 30 days extension (two land border crossings to Penang and one Singapore trip).

My visa at the moment is valid until the 16th of January 2019 and my plan is to stay until July. That equals in - I have to do another trip to Laos that I’ve already booked. After that visa, I’ll then just leave the country to do an exempt.

Also to clarify I got a new passport so I just had my old stamp from my last Singapore trip in the new one. But I guess they see it in their computer at immigration.

So to my question:

-Was I just unlucky at the airport with the immigration officer?

-Will I have more issues in the future? What can I do?

-Is it better to do two land borders with a group, say Myanmar?

-What are my options?

I can always show proof of founds, at least 20k in my wallet and bank statement that show more than enough.

Thanks in advance guys!