Is frequent gum sores an auto-immune problems? would that mean my immune system is weaker?

Canker sores: Possible triggers for canker sores include: a minor injury to your mouth from dental work, overzealous brushing, sports mishaps, spicy or acidic foods, or an accidental cheek bite toothpastes and mouth rinses containing sodium lauryl sulfate food sensitivities, particularly to chocolate, coffee, strawberries, eggs, nuts, cheese and highly acidic foods, such as pineapple a diet lacking in vitamins.

Probably not.: No, it means that something is causing the sores and you need to see your dentist and find out what and why you are having the sores. Quit self diagnosing and see a professional.