I only run very moderately. I wish I could run more as I find it very enjoyable.
When I first started running I suffered from calf cramp. I now take sports salt tablets to overcome this issue. I generally suffer from shin splints. I manage my running around the problem.
I've been to a recommended running shop to get advice and new shoes. I started as a heel runner but I've adjusted my techique so that I now land on my forefoot with my foot landing under my body. I was previously overstriding.
I've found that when I run out doors (generally on grass) that the shin splints return if I have more than two 5K sessions a week. Due to the approach of winter weather I currently do my running on a treadmil. I've found that the shin splints no longer appear but the calf cramps do!
Does this situation give you any insight in to what I may be doing wrong, or am I just a peculiarity on nature?!!