Can I be denied entry to Thailand on a tourist visa if I visit too often?

I need an advice please. Immigration becomes extremely strict and does not hesitate to refuse entry to people with valid visas. About me, I'm 53 years old, owns an apartment in Bangkok. I come twice a year with a tourist visa for years for holidays only. The maximum duration of my stay in Thailand over 1 year is maximum 5 months. My source of income is only from my country. Can an immigration officer question me and not allow me to get in Thailand on the pretext that I come to Thailand too often? What do you recommend me to do ? Thank you